diff --git a/cpu/esp32/Kconfig b/cpu/esp32/Kconfig
index 3ba9e075a9..0fbbc4e863 100644
--- a/cpu/esp32/Kconfig
+++ b/cpu/esp32/Kconfig
@@ -1,9 +1,5 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU
     default "esp32" if HAS_CPU_ESP32
diff --git a/cpu/esp32/Kconfig.common b/cpu/esp32/Kconfig.common
index db0e159f55..cf177789a3 100644
--- a/cpu/esp32/Kconfig.common
+++ b/cpu/esp32/Kconfig.common
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 if HAS_ARCH_ESP32
 
diff --git a/cpu/esp32/Kconfig.esp32 b/cpu/esp32/Kconfig.esp32
index 9be5e3b882..21d8217d40 100644
--- a/cpu/esp32/Kconfig.esp32
+++ b/cpu/esp32/Kconfig.esp32
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32
     bool
diff --git a/cpu/esp32/Kconfig.esp32c3 b/cpu/esp32/Kconfig.esp32c3
index 89f1bdbb10..0c180865b0 100644
--- a/cpu/esp32/Kconfig.esp32c3
+++ b/cpu/esp32/Kconfig.esp32c3
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32C3
     bool
diff --git a/cpu/esp32/Kconfig.esp32c6 b/cpu/esp32/Kconfig.esp32c6
index 4a8d2b3cf1..ce922398a5 100644
--- a/cpu/esp32/Kconfig.esp32c6
+++ b/cpu/esp32/Kconfig.esp32c6
@@ -1,8 +1,5 @@
-# Copyright (c) 2025 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2025 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32C6
     bool
diff --git a/cpu/esp32/Kconfig.esp32h2 b/cpu/esp32/Kconfig.esp32h2
index 68ebf779bf..8c0448c95e 100644
--- a/cpu/esp32/Kconfig.esp32h2
+++ b/cpu/esp32/Kconfig.esp32h2
@@ -1,8 +1,5 @@
-# Copyright (c) 2025 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2025 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32H2
     bool
diff --git a/cpu/esp32/Kconfig.esp32s2 b/cpu/esp32/Kconfig.esp32s2
index a91ef7bb39..ee12deef6e 100644
--- a/cpu/esp32/Kconfig.esp32s2
+++ b/cpu/esp32/Kconfig.esp32s2
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32S2
     bool
diff --git a/cpu/esp32/Kconfig.esp32s3 b/cpu/esp32/Kconfig.esp32s3
index 149953c7fd..6ce6973e38 100644
--- a/cpu/esp32/Kconfig.esp32s3
+++ b/cpu/esp32/Kconfig.esp32s3
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32S3
     bool
diff --git a/cpu/esp32/Kconfig.esp32x b/cpu/esp32/Kconfig.esp32x
index f336d9c546..d56d63bcaf 100644
--- a/cpu/esp32/Kconfig.esp32x
+++ b/cpu/esp32/Kconfig.esp32x
@@ -1,8 +1,5 @@
-# Copyright (c) 2023 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2023 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 # define a CPU configurationthat common is common for all ESP32x SoC variants
 
diff --git a/cpu/esp32/bootloader/sdkconfig.h b/cpu/esp32/bootloader/sdkconfig.h
index 31674cea94..a22d3cbc6b 100644
--- a/cpu/esp32/bootloader/sdkconfig.h
+++ b/cpu/esp32/bootloader/sdkconfig.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2021 iosabi
- * Copyright (C) 2024 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 iosabi
+ * SPDX-FileCopyrightText: 2024 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_common.h b/cpu/esp32/bootloader/sdkconfig_default_common.h
index 7abc18945e..dd7c9149e3 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_common.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32.h b/cpu/esp32/bootloader/sdkconfig_default_esp32.h
index cfda5ff06f..798591e7d9 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h b/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h
index 4224be7bc6..9fc68ff20c 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h b/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h
index ca6dd99e29..6ae8f8ff96 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h b/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h
index 96d369011b..f129f24cd4 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h b/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h
index baabd7185a..5f13dc1506 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/stub.c b/cpu/esp32/bootloader/stub.c
index f7d6b2c6cb..987a72eda4 100644
--- a/cpu/esp32/bootloader/stub.c
+++ b/cpu/esp32/bootloader/stub.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #define PTHREAD_CANCEL_DISABLE 1
diff --git a/cpu/esp32/doc.md b/cpu/esp32/doc.md
index 0d76de1e11..86d2323885 100644
--- a/cpu/esp32/doc.md
+++ b/cpu/esp32/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup     stdio_usb_serial_jtag  STDIO over ESP32 Debug Serial/JTAG
diff --git a/cpu/esp32/doc_esp32.doc.md b/cpu/esp32/doc_esp32.doc.md
index 898c2f3de4..a85aaba08e 100644
--- a/cpu/esp32/doc_esp32.doc.md
+++ b/cpu/esp32/doc_esp32.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32 ESP32 family
diff --git a/cpu/esp32/doc_esp32c3.doc.md b/cpu/esp32/doc_esp32c3.doc.md
index 134f74ea3d..88586de827 100644
--- a/cpu/esp32/doc_esp32c3.doc.md
+++ b/cpu/esp32/doc_esp32c3.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32c3 ESP32-C3 family
diff --git a/cpu/esp32/doc_esp32c6.doc.md b/cpu/esp32/doc_esp32c6.doc.md
index 97f899c507..f16bee89e2 100644
--- a/cpu/esp32/doc_esp32c6.doc.md
+++ b/cpu/esp32/doc_esp32c6.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32c6 ESP32-C6 family
diff --git a/cpu/esp32/doc_esp32h2.doc.md b/cpu/esp32/doc_esp32h2.doc.md
index d163c11d42..376025514a 100644
--- a/cpu/esp32/doc_esp32h2.doc.md
+++ b/cpu/esp32/doc_esp32h2.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32h2 ESP32-H2 family
diff --git a/cpu/esp32/doc_esp32s2.doc.md b/cpu/esp32/doc_esp32s2.doc.md
index f2b381ddcb..2583ee8a84 100644
--- a/cpu/esp32/doc_esp32s2.doc.md
+++ b/cpu/esp32/doc_esp32s2.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32s2 ESP32-S2 family
diff --git a/cpu/esp32/doc_esp32s3.doc.md b/cpu/esp32/doc_esp32s3.doc.md
index 3419105593..ea78085fa5 100644
--- a/cpu/esp32/doc_esp32s3.doc.md
+++ b/cpu/esp32/doc_esp32s3.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32s3 ESP32-S3 family
diff --git a/cpu/esp32/esp-ble-nimble/doc.md b/cpu/esp32/esp-ble-nimble/doc.md
index e53dc1316b..137e684168 100644
--- a/cpu/esp32/esp-ble-nimble/doc.md
+++ b/cpu/esp32/esp-ble-nimble/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2022 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2022 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup       cpu_esp32_esp_ble_nimble ESP32 Bluetooth LE HCI for NimBLE host
diff --git a/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c b/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c
index 510b816b54..8da4bf4cee 100644
--- a/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c
+++ b/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-eth/doc.md b/cpu/esp32/esp-eth/doc.md
index 33cbf24ea5..65020acf6b 100644
--- a/cpu/esp32/esp-eth/doc.md
+++ b/cpu/esp32/esp-eth/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2018 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2018 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup       cpu_esp32_esp_eth ESP32 Ethernet netdev interface
diff --git a/cpu/esp32/esp-eth/esp_eth_netdev.c b/cpu/esp32/esp-eth/esp_eth_netdev.c
index 85d3e82d4e..946693324a 100644
--- a/cpu/esp32/esp-eth/esp_eth_netdev.c
+++ b/cpu/esp32/esp-eth/esp_eth_netdev.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-eth/esp_eth_netdev.h b/cpu/esp32/esp-eth/esp_eth_netdev.h
index ea7ae0dde6..eceb1bbdba 100644
--- a/cpu/esp32/esp-eth/esp_eth_netdev.h
+++ b/cpu/esp32/esp-eth/esp_eth_netdev.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-eth/esp_eth_params.h b/cpu/esp32/esp-eth/esp_eth_params.h
index df2c0ac87e..8d55437019 100644
--- a/cpu/esp32/esp-eth/esp_eth_params.h
+++ b/cpu/esp32/esp-eth/esp_eth_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-idf/esp_idf_support.c b/cpu/esp32/esp-idf/esp_idf_support.c
index 289c9c53ee..83c0a3651d 100644
--- a/cpu/esp32/esp-idf/esp_idf_support.c
+++ b/cpu/esp32/esp-idf/esp_idf_support.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-idf/include/log/esp_log.h b/cpu/esp32/esp-idf/include/log/esp_log.h
index dd00ca3543..e0135b527c 100644
--- a/cpu/esp32/esp-idf/include/log/esp_log.h
+++ b/cpu/esp32/esp-idf/include/log/esp_log.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-idf/wpa_supplicant/Kconfig b/cpu/esp32/esp-idf/wpa_supplicant/Kconfig
index 365ff86cec..3be4a62dfa 100644
--- a/cpu/esp32/esp-idf/wpa_supplicant/Kconfig
+++ b/cpu/esp32/esp-idf/wpa_supplicant/Kconfig
@@ -1,10 +1,6 @@
-# Copyright (c) 2021 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
-#
+# SPDX-FileCopyrightText: 2021 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 rsource "esp_supplicant/Kconfig"
 rsource "port/Kconfig"
diff --git a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c
index 8754fa62b5..18ab82c01f 100644
--- a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c
+++ b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "esp_ieee802154.h"
diff --git a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h
index 23c6d1a9e1..9e4368fa44 100644
--- a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h
+++ b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-lcd/Kconfig b/cpu/esp32/esp-lcd/Kconfig
index a767fcc665..aedba95039 100644
--- a/cpu/esp32/esp-lcd/Kconfig
+++ b/cpu/esp32/esp-lcd/Kconfig
@@ -1,9 +1,5 @@
-# Copyright (c) 2023 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
-#
+# SPDX-FileCopyrightText: 2023 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 if USEMODULE_ESP_LCD
 
diff --git a/cpu/esp32/esp-lcd/esp_lcd_gpio.c b/cpu/esp32/esp-lcd/esp_lcd_gpio.c
index 12f2dcd51b..5b71147061 100644
--- a/cpu/esp32/esp-lcd/esp_lcd_gpio.c
+++ b/cpu/esp32/esp-lcd/esp_lcd_gpio.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-lcd/esp_lcd_mcu.c b/cpu/esp32/esp-lcd/esp_lcd_mcu.c
index ee0a53d7fb..86a8f4e56e 100644
--- a/cpu/esp32/esp-lcd/esp_lcd_mcu.c
+++ b/cpu/esp32/esp-lcd/esp_lcd_mcu.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp_ztimer.c b/cpu/esp32/esp_ztimer.c
index 5187fc3d8e..da0c5b5e64 100644
--- a/cpu/esp32/esp_ztimer.c
+++ b/cpu/esp32/esp_ztimer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/include/adc_arch.h b/cpu/esp32/include/adc_arch.h
index 20da6acecf..6073cc0667 100644
--- a/cpu/esp32/include/adc_arch.h
+++ b/cpu/esp32/include/adc_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/adc_arch_private.h b/cpu/esp32/include/adc_arch_private.h
index d20f1c7417..4dc01bd80a 100644
--- a/cpu/esp32/include/adc_arch_private.h
+++ b/cpu/esp32/include/adc_arch_private.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/can_esp.h b/cpu/esp32/include/can_esp.h
index f4941bdae2..72dbb0a438 100644
--- a/cpu/esp32/include/can_esp.h
+++ b/cpu/esp32/include/can_esp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/can_params.h b/cpu/esp32/include/can_params.h
index e2ede246c7..e19469def4 100644
--- a/cpu/esp32/include/can_params.h
+++ b/cpu/esp32/include/can_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf.h b/cpu/esp32/include/cpu_conf.h
index 1e92c776dc..4dd1ceefa4 100644
--- a/cpu/esp32/include/cpu_conf.h
+++ b/cpu/esp32/include/cpu_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32.h b/cpu/esp32/include/cpu_conf_esp32.h
index d34bcd35b0..7a72b8cc8b 100644
--- a/cpu/esp32/include/cpu_conf_esp32.h
+++ b/cpu/esp32/include/cpu_conf_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32c3.h b/cpu/esp32/include/cpu_conf_esp32c3.h
index 65b8b3933f..b6a6ce9b39 100644
--- a/cpu/esp32/include/cpu_conf_esp32c3.h
+++ b/cpu/esp32/include/cpu_conf_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32h2.h b/cpu/esp32/include/cpu_conf_esp32h2.h
index e32a72f551..78c356a4e8 100644
--- a/cpu/esp32/include/cpu_conf_esp32h2.h
+++ b/cpu/esp32/include/cpu_conf_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32s2.h b/cpu/esp32/include/cpu_conf_esp32s2.h
index 158a061c61..46d499ee7b 100644
--- a/cpu/esp32/include/cpu_conf_esp32s2.h
+++ b/cpu/esp32/include/cpu_conf_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32s3.h b/cpu/esp32/include/cpu_conf_esp32s3.h
index 6bef175c8c..c5a5381447 100644
--- a/cpu/esp32/include/cpu_conf_esp32s3.h
+++ b/cpu/esp32/include/cpu_conf_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h b/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h
index c42c1287cb..1ce2fb7736 100644
--- a/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h
+++ b/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/freertos/FreeRTOSConfig.h b/cpu/esp32/include/freertos/FreeRTOSConfig.h
index d822f99317..610e1c8e9e 100644
--- a/cpu/esp32/include/freertos/FreeRTOSConfig.h
+++ b/cpu/esp32/include/freertos/FreeRTOSConfig.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/gpio_arch.h b/cpu/esp32/include/gpio_arch.h
index 61e5c75660..1e203994c9 100644
--- a/cpu/esp32/include/gpio_arch.h
+++ b/cpu/esp32/include/gpio_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/gpio_ll_arch.h b/cpu/esp32/include/gpio_ll_arch.h
index 11e6fa2104..355102f501 100644
--- a/cpu/esp32/include/gpio_ll_arch.h
+++ b/cpu/esp32/include/gpio_ll_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/irq_arch.h b/cpu/esp32/include/irq_arch.h
index 481adceaa4..8c6fcc2cf2 100644
--- a/cpu/esp32/include/irq_arch.h
+++ b/cpu/esp32/include/irq_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/newlib.h b/cpu/esp32/include/newlib.h
index 6a2b798fcc..4c7d93b1ff 100644
--- a/cpu/esp32/include/newlib.h
+++ b/cpu/esp32/include/newlib.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu.h b/cpu/esp32/include/periph_cpu.h
index 94d2f49bee..e07d8b16e6 100644
--- a/cpu/esp32/include/periph_cpu.h
+++ b/cpu/esp32/include/periph_cpu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32.h b/cpu/esp32/include/periph_cpu_esp32.h
index edbf1c8b48..a291977e8f 100644
--- a/cpu/esp32/include/periph_cpu_esp32.h
+++ b/cpu/esp32/include/periph_cpu_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32c3.h b/cpu/esp32/include/periph_cpu_esp32c3.h
index d3d3542de9..c41545cfb9 100644
--- a/cpu/esp32/include/periph_cpu_esp32c3.h
+++ b/cpu/esp32/include/periph_cpu_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32h2.h b/cpu/esp32/include/periph_cpu_esp32h2.h
index 52fd2c0ed7..2ac8e1da62 100644
--- a/cpu/esp32/include/periph_cpu_esp32h2.h
+++ b/cpu/esp32/include/periph_cpu_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32s2.h b/cpu/esp32/include/periph_cpu_esp32s2.h
index 3890489cd1..9b63e2ac7e 100644
--- a/cpu/esp32/include/periph_cpu_esp32s2.h
+++ b/cpu/esp32/include/periph_cpu_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32s3.h b/cpu/esp32/include/periph_cpu_esp32s3.h
index 42bcca221b..1af4220399 100644
--- a/cpu/esp32/include/periph_cpu_esp32s3.h
+++ b/cpu/esp32/include/periph_cpu_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/rtt_arch.h b/cpu/esp32/include/rtt_arch.h
index 60132d3482..8b0ea3318f 100644
--- a/cpu/esp32/include/rtt_arch.h
+++ b/cpu/esp32/include/rtt_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig.h b/cpu/esp32/include/sdkconfig.h
index 25c6b7a3c1..2ae15b54b6 100644
--- a/cpu/esp32/include/sdkconfig.h
+++ b/cpu/esp32/include/sdkconfig.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32.h b/cpu/esp32/include/sdkconfig_esp32.h
index ea7af01f72..581de04299 100644
--- a/cpu/esp32/include/sdkconfig_esp32.h
+++ b/cpu/esp32/include/sdkconfig_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32c3.h b/cpu/esp32/include/sdkconfig_esp32c3.h
index 6d78cec43b..9568afe7d0 100644
--- a/cpu/esp32/include/sdkconfig_esp32c3.h
+++ b/cpu/esp32/include/sdkconfig_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32h2.h b/cpu/esp32/include/sdkconfig_esp32h2.h
index 4a54c81fcc..1c6d5f99b6 100644
--- a/cpu/esp32/include/sdkconfig_esp32h2.h
+++ b/cpu/esp32/include/sdkconfig_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32s2.h b/cpu/esp32/include/sdkconfig_esp32s2.h
index e416be8d8f..c2ecc75341 100644
--- a/cpu/esp32/include/sdkconfig_esp32s2.h
+++ b/cpu/esp32/include/sdkconfig_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32s3.h b/cpu/esp32/include/sdkconfig_esp32s3.h
index edc3b84bc9..b9a78ca1a7 100644
--- a/cpu/esp32/include/sdkconfig_esp32s3.h
+++ b/cpu/esp32/include/sdkconfig_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sys/features.h b/cpu/esp32/include/sys/features.h
index fd40d4c8f4..94021a586a 100644
--- a/cpu/esp32/include/sys/features.h
+++ b/cpu/esp32/include/sys/features.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sys/lock.h b/cpu/esp32/include/sys/lock.h
index 0597196409..a1b6333924 100644
--- a/cpu/esp32/include/sys/lock.h
+++ b/cpu/esp32/include/sys/lock.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/syscalls.h b/cpu/esp32/include/syscalls.h
index 436bcece05..19212cec83 100644
--- a/cpu/esp32/include/syscalls.h
+++ b/cpu/esp32/include/syscalls.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/irq_arch.c b/cpu/esp32/irq_arch.c
index c22ad1c928..ca2d23cd33 100644
--- a/cpu/esp32/irq_arch.c
+++ b/cpu/esp32/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/Kconfig b/cpu/esp32/periph/Kconfig
index 778dca8bf5..96aee71475 100644
--- a/cpu/esp32/periph/Kconfig
+++ b/cpu/esp32/periph/Kconfig
@@ -1,9 +1,5 @@
-# Copyright (c) 2021 HAW Hamburg
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
-#
+# SPDX-FileCopyrightText: 2021 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 choice ESP_FLASHPAGE_CAPACITY
     bool "Flashpage capacity"
diff --git a/cpu/esp32/periph/adc.c b/cpu/esp32/periph/adc.c
index b82a415e24..0d4182ede7 100644
--- a/cpu/esp32/periph/adc.c
+++ b/cpu/esp32/periph/adc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32.c b/cpu/esp32/periph/adc_arch_esp32.c
index f3860dd96d..f5d12a4990 100644
--- a/cpu/esp32/periph/adc_arch_esp32.c
+++ b/cpu/esp32/periph/adc_arch_esp32.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32c3.c b/cpu/esp32/periph/adc_arch_esp32c3.c
index 0db3a1afb2..147a47f1bf 100644
--- a/cpu/esp32/periph/adc_arch_esp32c3.c
+++ b/cpu/esp32/periph/adc_arch_esp32c3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32h2.c b/cpu/esp32/periph/adc_arch_esp32h2.c
index 8cd97384fc..4d27f1e2fa 100644
--- a/cpu/esp32/periph/adc_arch_esp32h2.c
+++ b/cpu/esp32/periph/adc_arch_esp32h2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32s2.c b/cpu/esp32/periph/adc_arch_esp32s2.c
index 3f11f33260..e4edab68cc 100644
--- a/cpu/esp32/periph/adc_arch_esp32s2.c
+++ b/cpu/esp32/periph/adc_arch_esp32s2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32s3.c b/cpu/esp32/periph/adc_arch_esp32s3.c
index cc9ce27d0e..3e79bd4772 100644
--- a/cpu/esp32/periph/adc_arch_esp32s3.c
+++ b/cpu/esp32/periph/adc_arch_esp32s3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/can.c b/cpu/esp32/periph/can.c
index 0749241176..37cede72e1 100644
--- a/cpu/esp32/periph/can.c
+++ b/cpu/esp32/periph/can.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/cpuid.c b/cpu/esp32/periph/cpuid.c
index 5799af54c9..fd0730c1b9 100644
--- a/cpu/esp32/periph/cpuid.c
+++ b/cpu/esp32/periph/cpuid.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/dac.c b/cpu/esp32/periph/dac.c
index 85bd84ffb8..3f1552ebb5 100644
--- a/cpu/esp32/periph/dac.c
+++ b/cpu/esp32/periph/dac.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/flashpage.c b/cpu/esp32/periph/flashpage.c
index bff983d097..a0c73e3a8b 100644
--- a/cpu/esp32/periph/flashpage.c
+++ b/cpu/esp32/periph/flashpage.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio.c b/cpu/esp32/periph/gpio.c
index 2874915f08..02b4ff35ea 100644
--- a/cpu/esp32/periph/gpio.c
+++ b/cpu/esp32/periph/gpio.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32.c b/cpu/esp32/periph/gpio_arch_esp32.c
index ba7a2c06ad..968e260f1a 100644
--- a/cpu/esp32/periph/gpio_arch_esp32.c
+++ b/cpu/esp32/periph/gpio_arch_esp32.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32c3.c b/cpu/esp32/periph/gpio_arch_esp32c3.c
index 7e1e2ca6c8..6057b6c189 100644
--- a/cpu/esp32/periph/gpio_arch_esp32c3.c
+++ b/cpu/esp32/periph/gpio_arch_esp32c3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32h2.c b/cpu/esp32/periph/gpio_arch_esp32h2.c
index aba1f97971..bf09f43f95 100644
--- a/cpu/esp32/periph/gpio_arch_esp32h2.c
+++ b/cpu/esp32/periph/gpio_arch_esp32h2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32s2.c b/cpu/esp32/periph/gpio_arch_esp32s2.c
index fcf24f0532..2e8bbb6b9b 100644
--- a/cpu/esp32/periph/gpio_arch_esp32s2.c
+++ b/cpu/esp32/periph/gpio_arch_esp32s2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32s3.c b/cpu/esp32/periph/gpio_arch_esp32s3.c
index bf554f8289..5d1e54c746 100644
--- a/cpu/esp32/periph/gpio_arch_esp32s3.c
+++ b/cpu/esp32/periph/gpio_arch_esp32s3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_ll.c b/cpu/esp32/periph/gpio_ll.c
index 0592b8b108..35adcba520 100644
--- a/cpu/esp32/periph/gpio_ll.c
+++ b/cpu/esp32/periph/gpio_ll.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_ll_irq.c b/cpu/esp32/periph/gpio_ll_irq.c
index a3ca97e638..d0a6f7af30 100644
--- a/cpu/esp32/periph/gpio_ll_irq.c
+++ b/cpu/esp32/periph/gpio_ll_irq.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/hwrng.c b/cpu/esp32/periph/hwrng.c
index c1eae7fb47..bb54af0fc7 100644
--- a/cpu/esp32/periph/hwrng.c
+++ b/cpu/esp32/periph/hwrng.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/i2c_hw.c b/cpu/esp32/periph/i2c_hw.c
index 4a39e4aab0..b0775026ec 100644
--- a/cpu/esp32/periph/i2c_hw.c
+++ b/cpu/esp32/periph/i2c_hw.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/pm.c b/cpu/esp32/periph/pm.c
index b5476b2605..e8948422b5 100644
--- a/cpu/esp32/periph/pm.c
+++ b/cpu/esp32/periph/pm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/pwm.c b/cpu/esp32/periph/pwm.c
index 6d16c9c6ba..827848ce9c 100644
--- a/cpu/esp32/periph/pwm.c
+++ b/cpu/esp32/periph/pwm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/rtt.c b/cpu/esp32/periph/rtt.c
index 55f0c0ee28..5d23595b84 100644
--- a/cpu/esp32/periph/rtt.c
+++ b/cpu/esp32/periph/rtt.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/rtt_hw_rtc.c b/cpu/esp32/periph/rtt_hw_rtc.c
index fa60d04a96..42aa7e14b1 100644
--- a/cpu/esp32/periph/rtt_hw_rtc.c
+++ b/cpu/esp32/periph/rtt_hw_rtc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/rtt_hw_sys.c b/cpu/esp32/periph/rtt_hw_sys.c
index 6d841c3e5f..323ad4cc5b 100644
--- a/cpu/esp32/periph/rtt_hw_sys.c
+++ b/cpu/esp32/periph/rtt_hw_sys.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/sdmmc.c b/cpu/esp32/periph/sdmmc.c
index 79759dd4fa..41fe4f5739 100644
--- a/cpu/esp32/periph/sdmmc.c
+++ b/cpu/esp32/periph/sdmmc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/spi.c b/cpu/esp32/periph/spi.c
index 0ba89e6ec9..a08ccdb298 100644
--- a/cpu/esp32/periph/spi.c
+++ b/cpu/esp32/periph/spi.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/timer.c b/cpu/esp32/periph/timer.c
index f7d00cad3e..b8b1fc341e 100644
--- a/cpu/esp32/periph/timer.c
+++ b/cpu/esp32/periph/timer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/uart.c b/cpu/esp32/periph/uart.c
index 2c9761fe26..29bb870392 100644
--- a/cpu/esp32/periph/uart.c
+++ b/cpu/esp32/periph/uart.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/startup.c b/cpu/esp32/startup.c
index 8a9e393804..ed8949f10b 100644
--- a/cpu/esp32/startup.c
+++ b/cpu/esp32/startup.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/stdatomic.c b/cpu/esp32/stdatomic.c
index a66d17f1b5..f7ac4953da 100644
--- a/cpu/esp32/stdatomic.c
+++ b/cpu/esp32/stdatomic.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c b/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c
index fd54f2dc27..96c417cab0 100644
--- a/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c
+++ b/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/syscalls.c b/cpu/esp32/syscalls.c
index 110ca1ca98..070b0390dc 100644
--- a/cpu/esp32/syscalls.c
+++ b/cpu/esp32/syscalls.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/usb_reset.c b/cpu/esp32/usb_reset.c
index 15aec846b8..c95d517a11 100644
--- a/cpu/esp32/usb_reset.c
+++ b/cpu/esp32/usb_reset.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2023 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/Kconfig b/cpu/esp8266/Kconfig
index 15954de294..2b82fcf771 100644
--- a/cpu/esp8266/Kconfig
+++ b/cpu/esp8266/Kconfig
@@ -1,8 +1,5 @@
-# Copyright (c) 2020 HAW Hamburg
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_CORE_XTENSA_L106
     bool
diff --git a/cpu/esp8266/doc.md b/cpu/esp8266/doc.md
index 1613b694bd..074a69ebe5 100644
--- a/cpu/esp8266/doc.md
+++ b/cpu/esp8266/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup        cpu_esp8266 ESP8266 / ESP8285
diff --git a/cpu/esp8266/freertos/portable.c b/cpu/esp8266/freertos/portable.c
index 7bd85c597e..09b0e7a89d 100644
--- a/cpu/esp8266/freertos/portable.c
+++ b/cpu/esp8266/freertos/portable.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp8266/include/cpu_conf.h b/cpu/esp8266/include/cpu_conf.h
index a54b39e81c..03ee026f33 100644
--- a/cpu/esp8266/include/cpu_conf.h
+++ b/cpu/esp8266/include/cpu_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/gpio_arch.h b/cpu/esp8266/include/gpio_arch.h
index e584dbb3ca..2f478559c4 100644
--- a/cpu/esp8266/include/gpio_arch.h
+++ b/cpu/esp8266/include/gpio_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/irq_arch.h b/cpu/esp8266/include/irq_arch.h
index 4cd85b2e3d..ad656d805d 100644
--- a/cpu/esp8266/include/irq_arch.h
+++ b/cpu/esp8266/include/irq_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/periph_cpu.h b/cpu/esp8266/include/periph_cpu.h
index b595bb3c44..f0722a9e98 100644
--- a/cpu/esp8266/include/periph_cpu.h
+++ b/cpu/esp8266/include/periph_cpu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/sdk_conf.h b/cpu/esp8266/include/sdk_conf.h
index 0cbc9c2f8d..3a59385c3f 100644
--- a/cpu/esp8266/include/sdk_conf.h
+++ b/cpu/esp8266/include/sdk_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/sys/types.h b/cpu/esp8266/include/sys/types.h
index 14f61e1af6..6c1a577cf0 100644
--- a/cpu/esp8266/include/sys/types.h
+++ b/cpu/esp8266/include/sys/types.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/syscalls.h b/cpu/esp8266/include/syscalls.h
index 8dbbfda1b5..2bc3dff5c0 100644
--- a/cpu/esp8266/include/syscalls.h
+++ b/cpu/esp8266/include/syscalls.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/uart_ll.h b/cpu/esp8266/include/uart_ll.h
index 4afd1695f3..9f60794db4 100644
--- a/cpu/esp8266/include/uart_ll.h
+++ b/cpu/esp8266/include/uart_ll.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/periph/adc.c b/cpu/esp8266/periph/adc.c
index 8c086f013a..e3e7854cc2 100644
--- a/cpu/esp8266/periph/adc.c
+++ b/cpu/esp8266/periph/adc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/cpuid.c b/cpu/esp8266/periph/cpuid.c
index 2f2d68fbf6..e9189f1a27 100644
--- a/cpu/esp8266/periph/cpuid.c
+++ b/cpu/esp8266/periph/cpuid.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/gpio.c b/cpu/esp8266/periph/gpio.c
index 414516e693..7c7113eedf 100644
--- a/cpu/esp8266/periph/gpio.c
+++ b/cpu/esp8266/periph/gpio.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/hwrng.c b/cpu/esp8266/periph/hwrng.c
index 877e9d6d27..88fd4d1490 100644
--- a/cpu/esp8266/periph/hwrng.c
+++ b/cpu/esp8266/periph/hwrng.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/pm.c b/cpu/esp8266/periph/pm.c
index 1885d21c5e..ed6684ea5b 100644
--- a/cpu/esp8266/periph/pm.c
+++ b/cpu/esp8266/periph/pm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/pwm.c b/cpu/esp8266/periph/pwm.c
index 4e4495cfdd..76d9cf7a8f 100644
--- a/cpu/esp8266/periph/pwm.c
+++ b/cpu/esp8266/periph/pwm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/rtt.c b/cpu/esp8266/periph/rtt.c
index 017d9d265a..4616ec90f7 100644
--- a/cpu/esp8266/periph/rtt.c
+++ b/cpu/esp8266/periph/rtt.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/spi.c b/cpu/esp8266/periph/spi.c
index 3377783111..cd0523daf6 100644
--- a/cpu/esp8266/periph/spi.c
+++ b/cpu/esp8266/periph/spi.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/timer.c b/cpu/esp8266/periph/timer.c
index 250d32046a..30e0d29bc4 100644
--- a/cpu/esp8266/periph/timer.c
+++ b/cpu/esp8266/periph/timer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/sdk/doc.md b/cpu/esp8266/sdk/doc.md
index 1347fc5277..ea76cc9bee 100644
--- a/cpu/esp8266/sdk/doc.md
+++ b/cpu/esp8266/sdk/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2018 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2018 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp8266_sdk ESP8266 SDK interface
diff --git a/cpu/esp8266/sdk/ets.c b/cpu/esp8266/sdk/ets.c
index 80c17bde95..4c9a30d52f 100644
--- a/cpu/esp8266/sdk/ets.c
+++ b/cpu/esp8266/sdk/ets.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/sdk/ets.h b/cpu/esp8266/sdk/ets.h
index d30b9e589b..8ffd09ab60 100644
--- a/cpu/esp8266/sdk/ets.h
+++ b/cpu/esp8266/sdk/ets.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/sdk/phy.h b/cpu/esp8266/sdk/phy.h
index 2ffb60294a..2079234fa2 100644
--- a/cpu/esp8266/sdk/phy.h
+++ b/cpu/esp8266/sdk/phy.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/sdk/sdk.h b/cpu/esp8266/sdk/sdk.h
index f8b2e39f3e..863d6888c3 100644
--- a/cpu/esp8266/sdk/sdk.h
+++ b/cpu/esp8266/sdk/sdk.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/sdk/system.c b/cpu/esp8266/sdk/system.c
index c280c2297e..9eeebd0063 100644
--- a/cpu/esp8266/sdk/system.c
+++ b/cpu/esp8266/sdk/system.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/sdk/system.h b/cpu/esp8266/sdk/system.h
index beb4d847f7..3507fafbc7 100644
--- a/cpu/esp8266/sdk/system.h
+++ b/cpu/esp8266/sdk/system.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/startup.c b/cpu/esp8266/startup.c
index ef809cf104..f3034c0db7 100644
--- a/cpu/esp8266/startup.c
+++ b/cpu/esp8266/startup.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/syscalls.c b/cpu/esp8266/syscalls.c
index 81b0074b0f..0c9763eed3 100644
--- a/cpu/esp8266/syscalls.c
+++ b/cpu/esp8266/syscalls.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/Kconfig b/cpu/esp_common/Kconfig
index be9aa6e4c5..47f1d7ba3d 100644
--- a/cpu/esp_common/Kconfig
+++ b/cpu/esp_common/Kconfig
@@ -1,8 +1,5 @@
-# Copyright (c) 2020 HAW Hamburg
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_ARCH_XTENSA
     bool
diff --git a/cpu/esp_common/doc.md b/cpu/esp_common/doc.md
index 25d27391e2..459cdf36ff 100644
--- a/cpu/esp_common/doc.md
+++ b/cpu/esp_common/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup    cpu_esp_common ESP Common
diff --git a/cpu/esp_common/esp-now/doc.md b/cpu/esp_common/esp-now/doc.md
index 0b60d0afee..9b82f7b54c 100644
--- a/cpu/esp_common/esp-now/doc.md
+++ b/cpu/esp_common/esp-now/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2018 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2018 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp_common_esp_now ESP-NOW netdev interface
diff --git a/cpu/esp_common/esp-now/esp_now_gnrc.c b/cpu/esp_common/esp-now/esp_now_gnrc.c
index ba97ddffd9..06166e91e5 100644
--- a/cpu/esp_common/esp-now/esp_now_gnrc.c
+++ b/cpu/esp_common/esp-now/esp_now_gnrc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Timo Rothenpieler
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Timo Rothenpieler
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-now/esp_now_gnrc.h b/cpu/esp_common/esp-now/esp_now_gnrc.h
index f1301b6994..112ade4e02 100644
--- a/cpu/esp_common/esp-now/esp_now_gnrc.h
+++ b/cpu/esp_common/esp-now/esp_now_gnrc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Timo Rothenpieler
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Timo Rothenpieler
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-now/esp_now_netdev.c b/cpu/esp_common/esp-now/esp_now_netdev.c
index c074846ad7..f3cf4ae78f 100644
--- a/cpu/esp_common/esp-now/esp_now_netdev.c
+++ b/cpu/esp_common/esp-now/esp_now_netdev.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-now/esp_now_netdev.h b/cpu/esp_common/esp-now/esp_now_netdev.h
index 7509ddf148..1b82c835cf 100644
--- a/cpu/esp_common/esp-now/esp_now_netdev.h
+++ b/cpu/esp_common/esp-now/esp_now_netdev.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-now/esp_now_params.h b/cpu/esp_common/esp-now/esp_now_params.h
index 18604925e2..694c19a552 100644
--- a/cpu/esp_common/esp-now/esp_now_params.h
+++ b/cpu/esp_common/esp-now/esp_now_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-riscv/exceptions.c b/cpu/esp_common/esp-riscv/exceptions.c
index 5099dec321..77d3e69224 100644
--- a/cpu/esp_common/esp-riscv/exceptions.c
+++ b/cpu/esp_common/esp-riscv/exceptions.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-riscv/irq_arch.c b/cpu/esp_common/esp-riscv/irq_arch.c
index 4a04cc025d..c60270e92a 100644
--- a/cpu/esp_common/esp-riscv/irq_arch.c
+++ b/cpu/esp_common/esp-riscv/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-riscv/thread_arch.c b/cpu/esp_common/esp-riscv/thread_arch.c
index b5d56f64d1..839f77b5ca 100644
--- a/cpu/esp_common/esp-riscv/thread_arch.c
+++ b/cpu/esp_common/esp-riscv/thread_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-wifi/doc.md b/cpu/esp_common/esp-wifi/doc.md
index d961cdd0df..20f74f2ca3 100644
--- a/cpu/esp_common/esp-wifi/doc.md
+++ b/cpu/esp_common/esp-wifi/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2019 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2019 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp_common_esp_wifi ESP-WiFi netdev interface
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c b/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c
index 54e47fd06f..2ef41990f8 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c
+++ b/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_netdev.c b/cpu/esp_common/esp-wifi/esp_wifi_netdev.c
index ec98c8f0a2..66a2ccb02b 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_netdev.c
+++ b/cpu/esp_common/esp-wifi/esp_wifi_netdev.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_netdev.h b/cpu/esp_common/esp-wifi/esp_wifi_netdev.h
index 940f75f3bc..ac1ce71581 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_netdev.h
+++ b/cpu/esp_common/esp-wifi/esp_wifi_netdev.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_params.h b/cpu/esp_common/esp-wifi/esp_wifi_params.h
index 4d70bb538c..5ea24add87 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_params.h
+++ b/cpu/esp_common/esp-wifi/esp_wifi_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-xtensa/exceptions.c b/cpu/esp_common/esp-xtensa/exceptions.c
index beca13b9fb..06c23608b9 100644
--- a/cpu/esp_common/esp-xtensa/exceptions.c
+++ b/cpu/esp_common/esp-xtensa/exceptions.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-xtensa/irq_arch.c b/cpu/esp_common/esp-xtensa/irq_arch.c
index f2b326a174..43ca0db433 100644
--- a/cpu/esp_common/esp-xtensa/irq_arch.c
+++ b/cpu/esp_common/esp-xtensa/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-xtensa/thread_arch.c b/cpu/esp_common/esp-xtensa/thread_arch.c
index c37ea4685c..f245d977a9 100644
--- a/cpu/esp_common/esp-xtensa/thread_arch.c
+++ b/cpu/esp_common/esp-xtensa/thread_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp_events.c b/cpu/esp_common/esp_events.c
index 831fd20dc2..8f27d13b23 100644
--- a/cpu/esp_common/esp_events.c
+++ b/cpu/esp_common/esp_events.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/freertos/event_groups.c b/cpu/esp_common/freertos/event_groups.c
index 789757624e..f3d10f7d4c 100644
--- a/cpu/esp_common/freertos/event_groups.c
+++ b/cpu/esp_common/freertos/event_groups.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/portable.c b/cpu/esp_common/freertos/portable.c
index a4f1107839..86a155f448 100644
--- a/cpu/esp_common/freertos/portable.c
+++ b/cpu/esp_common/freertos/portable.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/queue.c b/cpu/esp_common/freertos/queue.c
index 14c4149f0b..6eb350ef2a 100644
--- a/cpu/esp_common/freertos/queue.c
+++ b/cpu/esp_common/freertos/queue.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/ringbuf.c b/cpu/esp_common/freertos/ringbuf.c
index bcb485f7b0..d0a0201b02 100644
--- a/cpu/esp_common/freertos/ringbuf.c
+++ b/cpu/esp_common/freertos/ringbuf.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <assert.h>
diff --git a/cpu/esp_common/freertos/semphr.c b/cpu/esp_common/freertos/semphr.c
index c87470d892..d07b2e5dbc 100644
--- a/cpu/esp_common/freertos/semphr.c
+++ b/cpu/esp_common/freertos/semphr.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/task.c b/cpu/esp_common/freertos/task.c
index 9af2143f97..be472619a8 100644
--- a/cpu/esp_common/freertos/task.c
+++ b/cpu/esp_common/freertos/task.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/timers.c b/cpu/esp_common/freertos/timers.c
index aea3e9c464..7c84c356ba 100644
--- a/cpu/esp_common/freertos/timers.c
+++ b/cpu/esp_common/freertos/timers.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/include/architecture_arch.h b/cpu/esp_common/include/architecture_arch.h
index 3acd5ef69a..3aaed0f04c 100644
--- a/cpu/esp_common/include/architecture_arch.h
+++ b/cpu/esp_common/include/architecture_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/atomic_utils_arch.h b/cpu/esp_common/include/atomic_utils_arch.h
index d415516fd1..0983e903bc 100644
--- a/cpu/esp_common/include/atomic_utils_arch.h
+++ b/cpu/esp_common/include/atomic_utils_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/cpu.h b/cpu/esp_common/include/cpu.h
index 27c80bbbed..be05510d93 100644
--- a/cpu/esp_common/include/cpu.h
+++ b/cpu/esp_common/include/cpu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/cpu_conf_common.h b/cpu/esp_common/include/cpu_conf_common.h
index a3e209ceaf..0d85796bd1 100644
--- a/cpu/esp_common/include/cpu_conf_common.h
+++ b/cpu/esp_common/include/cpu_conf_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/esp_common.h b/cpu/esp_common/include/esp_common.h
index 5fb1ba764d..d8f3b4ea7c 100644
--- a/cpu/esp_common/include/esp_common.h
+++ b/cpu/esp_common/include/esp_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/esp_common_log.h b/cpu/esp_common/include/esp_common_log.h
index 6f3818a33f..8704b1a639 100644
--- a/cpu/esp_common/include/esp_common_log.h
+++ b/cpu/esp_common/include/esp_common_log.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/exceptions.h b/cpu/esp_common/include/exceptions.h
index 7d89a10fb4..34610b824d 100644
--- a/cpu/esp_common/include/exceptions.h
+++ b/cpu/esp_common/include/exceptions.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/freertos/FreeRTOS.h b/cpu/esp_common/include/freertos/FreeRTOS.h
index 897924338f..891e3ce6fc 100644
--- a/cpu/esp_common/include/freertos/FreeRTOS.h
+++ b/cpu/esp_common/include/freertos/FreeRTOS.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/event_groups.h b/cpu/esp_common/include/freertos/event_groups.h
index 404f899111..fc718a88b0 100644
--- a/cpu/esp_common/include/freertos/event_groups.h
+++ b/cpu/esp_common/include/freertos/event_groups.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/idf_additions.h b/cpu/esp_common/include/freertos/idf_additions.h
index f10cb9152b..9e6dd7ba9d 100644
--- a/cpu/esp_common/include/freertos/idf_additions.h
+++ b/cpu/esp_common/include/freertos/idf_additions.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2024 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2024 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/portable.h b/cpu/esp_common/include/freertos/portable.h
index 4860d32977..4a9b283d39 100644
--- a/cpu/esp_common/include/freertos/portable.h
+++ b/cpu/esp_common/include/freertos/portable.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/portmacro.h b/cpu/esp_common/include/freertos/portmacro.h
index 40e02a8647..e90d63c47d 100644
--- a/cpu/esp_common/include/freertos/portmacro.h
+++ b/cpu/esp_common/include/freertos/portmacro.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/queue.h b/cpu/esp_common/include/freertos/queue.h
index 216cbb7d4b..2d8ae98c82 100644
--- a/cpu/esp_common/include/freertos/queue.h
+++ b/cpu/esp_common/include/freertos/queue.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/ringbuf.h b/cpu/esp_common/include/freertos/ringbuf.h
index 4a3b08a26d..3e23dea26c 100644
--- a/cpu/esp_common/include/freertos/ringbuf.h
+++ b/cpu/esp_common/include/freertos/ringbuf.h
@@ -1,15 +1,10 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
- *
- * At the moment this header file is empty and exists only to avoid
- * compilation errors for files of the ESP-IDF that include `ringbuf.h`,
- * such as `uart.h` even if they do not need definitions from `ringbuf.h`.
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/freertos/semphr.h b/cpu/esp_common/include/freertos/semphr.h
index b88419bed3..ab54b66be8 100644
--- a/cpu/esp_common/include/freertos/semphr.h
+++ b/cpu/esp_common/include/freertos/semphr.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/task.h b/cpu/esp_common/include/freertos/task.h
index f7ff629d29..3ea90c728a 100644
--- a/cpu/esp_common/include/freertos/task.h
+++ b/cpu/esp_common/include/freertos/task.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/timers.h b/cpu/esp_common/include/freertos/timers.h
index 096bda1dc3..83ed304e49 100644
--- a/cpu/esp_common/include/freertos/timers.h
+++ b/cpu/esp_common/include/freertos/timers.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/xtensa_api.h b/cpu/esp_common/include/freertos/xtensa_api.h
index 20d0f26ae2..bd6adcc6fe 100644
--- a/cpu/esp_common/include/freertos/xtensa_api.h
+++ b/cpu/esp_common/include/freertos/xtensa_api.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/gpio_arch_common.h b/cpu/esp_common/include/gpio_arch_common.h
index b3bf618417..fef60cbb7e 100644
--- a/cpu/esp_common/include/gpio_arch_common.h
+++ b/cpu/esp_common/include/gpio_arch_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/irq_arch_common.h b/cpu/esp_common/include/irq_arch_common.h
index 6dc8abe95e..8c9d0f094c 100644
--- a/cpu/esp_common/include/irq_arch_common.h
+++ b/cpu/esp_common/include/irq_arch_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/log_module.h b/cpu/esp_common/include/log_module.h
index 93757fee37..922a40f195 100644
--- a/cpu/esp_common/include/log_module.h
+++ b/cpu/esp_common/include/log_module.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/syscalls_common.h b/cpu/esp_common/include/syscalls_common.h
index f73009a958..84454ae0cd 100644
--- a/cpu/esp_common/include/syscalls_common.h
+++ b/cpu/esp_common/include/syscalls_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/thread_arch.h b/cpu/esp_common/include/thread_arch.h
index 3730c49af2..d811a45433 100644
--- a/cpu/esp_common/include/thread_arch.h
+++ b/cpu/esp_common/include/thread_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/tools.h b/cpu/esp_common/include/tools.h
index bd2c954ad1..ac86747746 100644
--- a/cpu/esp_common/include/tools.h
+++ b/cpu/esp_common/include/tools.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/xtensa_conf.h b/cpu/esp_common/include/xtensa_conf.h
index 417bbc3742..ad4cdd287f 100644
--- a/cpu/esp_common/include/xtensa_conf.h
+++ b/cpu/esp_common/include/xtensa_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/irq_arch.c b/cpu/esp_common/irq_arch.c
index 2d8da46c45..e3072bca6e 100644
--- a/cpu/esp_common/irq_arch.c
+++ b/cpu/esp_common/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/lib_printf.c b/cpu/esp_common/lib_printf.c
index 78bfa68050..b234a7e73c 100644
--- a/cpu/esp_common/lib_printf.c
+++ b/cpu/esp_common/lib_printf.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/periph/flash.c b/cpu/esp_common/periph/flash.c
index ed86512f45..d01d0404ad 100644
--- a/cpu/esp_common/periph/flash.c
+++ b/cpu/esp_common/periph/flash.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/periph/i2c_sw.c b/cpu/esp_common/periph/i2c_sw.c
index ea8f333cc9..0540a2f3a3 100644
--- a/cpu/esp_common/periph/i2c_sw.c
+++ b/cpu/esp_common/periph/i2c_sw.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/periph/uart.c b/cpu/esp_common/periph/uart.c
index fd5fd21a2e..99c4dd6d09 100644
--- a/cpu/esp_common/periph/uart.c
+++ b/cpu/esp_common/periph/uart.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/syscalls.c b/cpu/esp_common/syscalls.c
index 13e2ae441f..d50a045eb8 100644
--- a/cpu/esp_common/syscalls.c
+++ b/cpu/esp_common/syscalls.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/thread_arch.c b/cpu/esp_common/thread_arch.c
index 4dcff88eee..ffa096ac25 100644
--- a/cpu/esp_common/thread_arch.c
+++ b/cpu/esp_common/thread_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/tools.c b/cpu/esp_common/tools.c
index 2ee52963ba..fda1069a97 100644
--- a/cpu/esp_common/tools.c
+++ b/cpu/esp_common/tools.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**