drivers: can: Add CAN driver support for STM32

This commit adds low level driver support for STM32 micro controllers.
It is tested on stm32f072b in loopback and normal mode.

Signed-off-by: Alexander Wachter <[email protected]>

Author: Alexander Wachter

drivers/can/CMakeLists.txt

@@ -1 +1,2 @@
+zephyr_sources_ifdef(CONFIG_CAN_STM32	stm32_can.c)
 zephyr_sources_ifdef(CONFIG_USERSPACE   can_handlers.c)

drivers/can/Kconfig

@@ -67,5 +67,6 @@ config CAN_1
 	help
 	  Enable CAN controller 1
 
+source "drivers/can/Kconfig.stm32"
 
 endif # CAN

drivers/can/Kconfig.stm32

@@ -0,0 +1,23 @@
+# Kconfig.stm32 - STM32 CAN configuration options
+
+#
+# Copyright (c) 2018 Alexander Wachter
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+config CAN_STM32
+	bool "STM32 CAN Driver"
+	default n
+	select USE_STM32_HAL_CAN
+	help
+	  Enable STM32 CAN Driver (tested on stm32F0 series)
+
+config CAN_MAX_FILTER
+	int "Maximum number of concurrent active filters"
+	depends on CAN_STM32
+	default 5
+	range 1 56
+	help
+	  Defines the array size of the callback/msgq pointers.
+	  Must be at least the size of concurrent reads.