devicetree: LINKER_DT_NODE_REGION_NAME added

Adds a macro to convert a devicetree node to the name of a linker memory
region.

Signed-off-by: Jordan Yates <[email protected]>

Author: Jordan Yates

include/linker/devicetree_regions.h

@@ -7,6 +7,34 @@
  * Generate memory regions from devicetree nodes.
  */
 
+/**
+ * @brief Get the linker memory-region name
+ *
+ * This attempts to use the zephyr,memory-region property, falling back
+ * to the node path if it doesn't exist.
+ *
+ * Example devicetree fragment:
+ *
+ *     / {
+ *             soc {
+ *                     sram1: memory@2000000 {
+ *                         zephyr,memory-region = "MY_NAME";
+ *                     };
+ *                     sram2: memory@2001000 { ... };
+ *             };
+ *     };
+ *
+ * Example usage:
+ *
+ *    LINKER_DT_NODE_REGION_NAME(DT_NODELABEL(sram1)) // "MY_NAME"
+ *    LINKER_DT_NODE_REGION_NAME(DT_NODELABEL(sram2)) // "/soc/memory@2001000"
+ *
+ * @param node_id node identifier
+ * @return the name of the memory memory region the node will generate
+ */
+#define LINKER_DT_NODE_REGION_NAME(node_id) \
+	DT_PROP_OR(node_id, zephyr_memory_region, DT_NODE_PATH(node_id))
+
 /* Declare a memory region */
 #define _REGION_DECLARE(name, attr, node) name(attr) : \
 	ORIGIN = DT_REG_ADDR(node),		       \