Kconfig: add CONFIG_BOARD_REVISION

Propagate the board revision to Kconfig via the environment.

This is useful for application code to have access to for similar
reasons that CONFIG_BOARD is useful.

Signed-off-by: Martí Bolívar <[email protected]>

Author: mbolivar-nordic

boards/Kconfig

@@ -9,6 +9,14 @@ config BOARD
 	  if not found we look for the linker file in
 	  soc/<arch>/<family>/<series>
 
+config BOARD_REVISION
+	def_string "$BOARD_REVISION"
+	help
+	  If the BOARD has a revision field set, this is the revision.
+	  Otherwise, it is the empty string. For example, if BOARD is
+	  "plank@foo", this option will be "foo". If BOARD is "plank",
+	  this option will be the empty string.
+
 config BOARD_DEPRECATED_RELEASE
 	string
 	help

cmake/modules/kconfig.cmake

@@ -115,6 +115,7 @@ set(COMMON_KCONFIG_ENV_SETTINGS
   ARCH=${ARCH}
   ARCH_DIR=${ARCH_DIR}
   BOARD_DIR=${BOARD_DIR}
+  BOARD_REVISION=${BOARD_REVISION}
   KCONFIG_BINARY_DIR=${KCONFIG_BINARY_DIR}
   ZEPHYR_TOOLCHAIN_VARIANT=${ZEPHYR_TOOLCHAIN_VARIANT}
   TOOLCHAIN_KCONFIG_DIR=${TOOLCHAIN_KCONFIG_DIR}