dm: core: Allow adding ofnode subnodes

Add this feature to the ofnode interface, supporting both livetree and
flattree. If the node exists it is returned, along with a -EEXIST error.
Update the functions it calls to handle this too.

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

2 files changed, 28 insertions, 0 deletions

diff --git a/include/dm/of_access.h b/include/dm/of_access.h
index d8c6d11643..dd70b44344 100644
--- a/include/dm/of_access.h
+++ b/include/dm/of_access.h
@@ -565,4 +565,19 @@ struct device_node *of_get_stdout(void);
 int of_write_prop(struct device_node *np, const char *propname, int len,
 		  const void *value);
 
+/**
+ * of_add_subnode() - add a new subnode to a node
+ *
+ * @node:	parent node to add to
+ * @name:	name of subnode
+ * @len:	length of name (so the caller does not need to nul-terminate a
+ *	partial string), or -1 for strlen(@name)
+ * @subnodep:	returns pointer to new subnode (valid if the function returns 0
+ *	or -EEXIST)
+ * Returns 0 if OK, -EEXIST if already exists, -ENOMEM if out of memory, other
+ * -ve on other error
+ */
+int of_add_subnode(struct device_node *node, const char *name, int len,
+		   struct device_node **subnodep);
+
 #endif
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 6414b4648f..ec1ab0ce15 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -1300,6 +1300,19 @@ static inline const char *ofnode_conf_read_str(const char *prop_name)
 {
 	return NULL;
 }
+
 #endif /* CONFIG_DM */
 
+/**
+ * of_add_subnode() - add a new subnode to a node
+ *
+ * @parent:	parent node to add to
+ * @name:	name of subnode
+ * @nodep:	returns pointer to new subnode (valid if the function returns 0
+ *	or -EEXIST)
+ * Returns 0 if OK, -EEXIST if already exists, -ENOMEM if out of memory, other
+ * -ve on other error
+ */
+int ofnode_add_subnode(ofnode parent, const char *name, ofnode *nodep);
+
 #endif