cache: adds CONFIG_SOC_CACHE

This allows SoC to define their custom cache related functions
and are used by sys_cache_*() functions.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

arch/Kconfig

@@ -1159,6 +1159,14 @@ config ARCH_CACHE
 	help
 	  Integrated on-core cache controller
 
+config SOC_CACHE
+	bool "SoC specific cache controller"
+	depends on SOC_HAS_CACHE_FUNCTIONS
+	help
+	  SoC specific cache controller.
+
+	  This requires soc_cache.h file to exist in search path.
+
 config EXTERNAL_CACHE
 	bool "External cache controller"
 	help

include/zephyr/cache.h

@@ -27,6 +27,9 @@ extern "C" {
 #elif defined(CONFIG_ARCH_CACHE)
 #include <zephyr/arch/cache.h>
 
+#elif defined(CONFIG_SOC_CACHE)
+#include <soc_cache.h>
+
 #endif
 
 /**

soc/Kconfig

@@ -40,3 +40,9 @@ config SOC_HAS_RUNTIME_NUM_CPUS
 	help
 	  Should be selected if SoC handles determining the number of CPUs
 	  at runtime.
+
+config SOC_HAS_CACHE_FUNCTIONS
+	bool
+	help
+	  Should be selected if SoC provides custom method for cache related
+	  operations.