From 4d19b77fce2e449c97abc4e1d62b66860d5c4cec Mon Sep 17 00:00:00 2001
From: Gunar Schorcht <gunar@schorcht.net>
Date: Sun, 19 Dec 2021 12:20:34 +0100
Subject: [PATCH] cpu/esp8266: add CPU frequency selection to Kconfig

---
 cpu/esp8266/Kconfig            | 16 ++++++++++++++++
 cpu/esp8266/include/cpu_conf.h | 14 ++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/cpu/esp8266/Kconfig b/cpu/esp8266/Kconfig
index cca627a7d6..c4390765d7 100644
--- a/cpu/esp8266/Kconfig
+++ b/cpu/esp8266/Kconfig
@@ -64,6 +64,22 @@ config CPU_MODEL
 config CPU
     default "esp8266" if CPU_FAM_ESP8266
 
+menu "ESP8266 specific configurations"
+    depends on TEST_KCONFIG
+    depends on HAS_ARCH_ESP8266
+
+    choice
+        bool "CPU clock frequency"
+        default ESP8266_CPU_FREQUENCY_80
+
+        config ESP8266_CPU_FREQUENCY_80
+            bool "80 MHz"
+        config ESP8266_CPU_FREQUENCY_160
+            bool "160 MHz"
+    endchoice
+
+endmenu
+
 source "$(RIOTCPU)/esp_common/Kconfig"
 
 config MODULE_ESP_I2C_SW
diff --git a/cpu/esp8266/include/cpu_conf.h b/cpu/esp8266/include/cpu_conf.h
index 380f710684..09642c9b49 100644
--- a/cpu/esp8266/include/cpu_conf.h
+++ b/cpu/esp8266/include/cpu_conf.h
@@ -33,6 +33,16 @@ extern "C" {
 * @name    Clock configuration
 * @{
 */
+
+#ifndef DOXYGEN
+/* Mapping of Kconfig defines to the respective enumeration values */
+#if CONFIG_ESP8266_CPU_FREQUENCY_80
+#define ESP8266_CPU_FREQUENCY   80
+#elif CONFIG_ESP8266_CPU_FREQUENCY_160
+#define ESP8266_CPU_FREQUENCY   160
+#endif
+#endif
+
 /**
  * @brief   Defines the CPU frequency in MHz
  *
@@ -41,6 +51,10 @@ extern "C" {
 #ifndef ESP8266_CPU_FREQUENCY
 #define ESP8266_CPU_FREQUENCY   (80)
 #endif
+
+/**
+ * @brief   Mapping configured ESP8266 default clock to CLOCK_CORECLOCK define
+ */
 #define CLOCK_CORECLOCK         (1000000UL * ESP8266_CPU_FREQUENCY)
 /** @} */