core: add ofnode_get_by_phandle() api

We need to get ofnode from a phandle, add interface to support
both live dt and fdt.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/core/ofnode.c

@@ -188,6 +188,19 @@ const char *ofnode_get_name(ofnode node)
 	return fdt_get_name(gd->fdt_blob, ofnode_to_offset(node), NULL);
 }
 
+ofnode ofnode_get_by_phandle(uint phandle)
+{
+	ofnode node;
+
+	if (of_live_active())
+		node = np_to_ofnode(of_find_node_by_phandle(phandle));
+	else
+		node.of_offset = fdt_node_offset_by_phandle(gd->fdt_blob,
+							    phandle);
+
+	return node;
+}
+
 int ofnode_read_size(ofnode node, const char *propname)
 {
 	int len;

include/dm/ofnode.h

@@ -317,6 +317,14 @@ ofnode ofnode_get_parent(ofnode node);
  */
 const char *ofnode_get_name(ofnode node);
 
+/**
+ * ofnode_get_by_phandle() - get ofnode from phandle
+ *
+ * @phandle:	phandle to look up
+ * @return ofnode reference to the phandle
+ */
+ofnode ofnode_get_by_phandle(uint phandle);
+
 /**
  * ofnode_read_size() - read the size of a property
  *