dm: core: Support copying properties with ofnode

Add a function to copy properties from one node to another.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/dm/ofnode.h

@@ -1505,4 +1505,20 @@ static inline const char *ofnode_conf_read_str(const char *prop_name)
  */
 int ofnode_add_subnode(ofnode parent, const char *name, ofnode *nodep);
 
+/**
+ * ofnode_copy_props() - copy all properties from one node to another
+ *
+ * Makes a copy of all properties from the source note in the destination node.
+ * Existing properties in the destination node remain unchanged, except that
+ * any with the same name are overwritten, including changing the size of the
+ * property.
+ *
+ * For livetree, properties are copied / allocated, so the source tree does not
+ * need to be present afterwards.
+ *
+ * @src: Source node to read properties from
+ * @dst: Destination node to write properties too
+ */
+int ofnode_copy_props(ofnode src, ofnode dst);
+
 #endif