build: support out of tree SoC definition

Add the glue to make this work with SoC code outside of the tree.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

CMakeLists.txt

@@ -50,9 +50,9 @@ zephyr_library_named(zephyr)
 zephyr_include_directories(
   kernel/include
   arch/${ARCH}/include
-  soc/${ARCH}/${SOC_PATH}
-  soc/${ARCH}/${SOC_PATH}/include
-  soc/${ARCH}/${SOC_FAMILY}/include
+  ${SOC_DIR}/${ARCH}/${SOC_PATH}
+  ${SOC_DIR}/${ARCH}/${SOC_PATH}/include
+  ${SOC_DIR}/${ARCH}/${SOC_FAMILY}/include
   ${BOARD_DIR}
   include
   include/drivers
@@ -295,7 +295,7 @@ else()
   set(LINKER_SCRIPT ${BOARD_DIR}/linker.ld)
   if(NOT EXISTS ${LINKER_SCRIPT})
     # If not available, try an SoC specific linker file
-    set(LINKER_SCRIPT ${ZEPHYR_BASE}/soc/${ARCH}/${SOC_PATH}/linker.ld)
+    set(LINKER_SCRIPT ${SOC_DIR}/${ARCH}/${SOC_PATH}/linker.ld)
   endif()
 endif()
 
@@ -337,9 +337,9 @@ add_subdirectory(misc)
 include(misc/generated/CMakeLists.txt)
 
 if(EXISTS soc/${ARCH}/CMakeLists.txt)
-  add_subdirectory(soc/${ARCH})
+  add_subdirectory(${SOC_DIR}/${ARCH} soc/${ARCH})
 else()
-  add_subdirectory(soc/${ARCH}/${SOC_PATH})
+  add_subdirectory(${SOC_DIR}/${ARCH}/${SOC_PATH} soc/${ARCH}/${SOC_PATH})
 endif()
 
 add_subdirectory(boards)

Kconfig.zephyr

@@ -18,11 +18,11 @@
 # Note: $ARCH and $BOARD_DIR might be glob patterns.
 source "$(BOARD_DIR)/Kconfig.defconfig"
 
-source "soc/$(ARCH)/*/Kconfig.defconfig"
+source "$(SOC_DIR)/$(ARCH)/*/Kconfig.defconfig"
 
 source "boards/Kconfig"
 
-source "soc/Kconfig"
+source "$(SOC_DIR)/Kconfig"
 
 source "arch/Kconfig"
 

cmake/app/boilerplate.cmake

@@ -195,8 +195,11 @@ set(CACHED_BOARD ${BOARD} CACHE STRING "Selected board")
 if(NOT BOARD_ROOT)
   set(BOARD_ROOT ${ZEPHYR_BASE})
 endif()
+
 if(NOT SOC_ROOT)
-  set(SOC_ROOT ${ZEPHYR_BASE})
+  set(SOC_DIR ${ZEPHYR_BASE}/soc)
+else()
+  set(SOC_DIR ${SOC_ROOT}/soc)
 endif()
 
 find_path(BOARD_DIR NAMES "${BOARD}_defconfig" PATHS ${BOARD_ROOT}/boards/*/* NO_DEFAULT_PATH)

cmake/dts.cmake

@@ -90,7 +90,7 @@ if(CONFIG_HAS_DTS)
   if(EXISTS ${DTS_BOARD_FIXUP_FILE})
     set(DTS_BOARD_FIXUP ${DTS_BOARD_FIXUP_FILE})
   endif()
-  set_ifndef(DTS_SOC_FIXUP_FILE ${ZEPHYR_BASE}/soc/${ARCH}/${SOC_PATH}/dts.fixup)
+  set_ifndef(DTS_SOC_FIXUP_FILE ${SOC_DIR}/${ARCH}/${SOC_PATH}/dts.fixup)
   if(EXISTS ${DTS_SOC_FIXUP_FILE})
     set(DTS_SOC_FIXUP ${DTS_SOC_FIXUP_FILE})
   endif()

cmake/kconfig.cmake

@@ -22,6 +22,7 @@ set(ENV{KCONFIG_AUTOHEADER} ${AUTOCONF_H})
 # files for other architectures
 set(ENV{ARCH}      ${ARCH})
 set(ENV{BOARD_DIR} ${BOARD_DIR})
+set(ENV{SOC_DIR}   ${SOC_DIR})
 
 add_custom_target(
   menuconfig

doc/CMakeLists.txt

@@ -117,6 +117,7 @@ add_custom_target(
   srctree=${ZEPHYR_BASE}
   BOARD_DIR=boards/*/*/
   ARCH=*
+  SOC_DIR=soc/
   KERNELVERSION=${PROJECT_VERSION}
   SRCARCH=x86
   ${PYTHON_EXECUTABLE} scripts/genrest.py Kconfig ${RST_OUT}/doc/reference/kconfig/

soc/Kconfig

@@ -2,11 +2,11 @@
 choice
 	prompt "SoC/CPU/Configuration Selection"
 
-source "soc/$ENV_VAR_ARCH/*/Kconfig.soc"
+source "$(SOC_DIR)/$(ARCH)/*/Kconfig.soc"
 
 endchoice
 
 menu "Hardware Configuration"
-osource "soc/$ENV_VAR_ARCH/*/Kconfig"
+osource "$(SOC_DIR)/$(ARCH)/*/Kconfig"
 
 endmenu