dm: core: Add ofnode_for_each_subnode()
Add a convenience macro to iterate over subnodes of a node. Make use of
this where appropriate in the code.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index de2769e..79374b8 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -628,4 +628,28 @@
int ofnode_read_resource_byname(ofnode node, const char *name,
struct resource *res);
+/**
+ * ofnode_for_each_subnode() - iterate over all subnodes of a parent
+ *
+ * @node: child node (ofnode, lvalue)
+ * @parent: parent node (ofnode)
+ *
+ * This is a wrapper around a for loop and is used like so:
+ *
+ * ofnode node;
+ *
+ * ofnode_for_each_subnode(node, parent) {
+ * Use node
+ * ...
+ * }
+ *
+ * Note that this is implemented as a macro and @node is used as
+ * iterator in the loop. The parent variable can be a constant or even a
+ * literal.
+ */
+#define ofnode_for_each_subnode(node, parent) \
+ for (node = ofnode_first_subnode(parent); \
+ ofnode_valid(node); \
+ node = ofnode_next_subnode(node))
+
#endif