drivers/slipdev : Expose to Kconfig

Expose configurations to Kconfig

drivers/Kconfig.net

@@ -14,6 +14,7 @@ rsource "cc110x/Kconfig"
 rsource "dose/Kconfig"
 rsource "mrf24j40/Kconfig"
 rsource "pn532/Kconfig"
+rsource "slipdev/Kconfig"
 source "$(RIOTCPU)/nrf52/radio/nrf802154/Kconfig"
 endmenu # Network Device Drivers
 

drivers/include/slipdev.h

@@ -45,6 +45,10 @@ extern "C" {
  *
  * @pre Needs to be power of two and `<= INT_MAX`
  */
+#ifdef CONFIG_SLIPDEV_BUFSIZE_EXP
+#define CONFIG_SLIPDEV_BUFSIZE (1<<CONFIG_SLIPDEV_BUFSIZE_EXP)
+#endif
+
 #ifndef CONFIG_SLIPDEV_BUFSIZE
 #define CONFIG_SLIPDEV_BUFSIZE (2048U)
 #endif

drivers/slipdev/Kconfig

@@ -0,0 +1,25 @@
+# Copyright (c) 2020 Freie Universitaet Berlin
+#
+# 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.
+#
+menuconfig KCONFIG_MODULE_SLIPDEV
+    bool "Configure SLIPDEV driver"
+    depends on MODULE_SLIPDEV
+    help
+        Configure the SLIPDEV driver using Kconfig.
+
+if KCONFIG_MODULE_SLIPDEV
+
+config SLIPDEV_BUFSIZE_EXP
+    int "Buffer size (as exponent of 2^n)"
+    default 11
+    range 0 31
+    help
+        UART buffer size used for TX and RX buffers.
+        Reduce this value if your expected traffic does
+        not include full IPv6 MTU.
+        Value represents the exponent n of 2^n.
+
+endif # KCONFIG_MODULE_SLIPDEV