fdt: introduce fdtdec_get_child_count

Introduce fdtdec_get_child_count for get the number of subnodes of one parent node. Signed-off-by: Peng Fan <van.freenix@gmail.com> Cc: Simon Glass <sjg@chromium.org> Acked-by: Simon Glass <sjg@chromium.org>

fdt: introduce fdtdec_get_child_count
Introduce fdtdec_get_child_count for get the number of subnodes of one parent node. Signed-off-by: Peng Fan <van.freenix@gmail.com> Cc: Simon Glass <sjg@chromium.org> Acked-by: Simon Glass <sjg@chromium.org>
Peng Fan · Anatolij Gustschin
1 parent c4a45d4bdd
Showing 2 changed files with 20 additions and 0 deletions Side-by-side Diff
include/fdtdec.h
lib/fdtdec.c
@@ -722,6 +722,15 @@
  */
 int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
  
+/*
+ * Count child nodes of one parent node.
+ *
+ * @param blob	FDT blob
+ * @param node	parent node
+ * @return number of child node; 0 if there is not child node
+ */
+int fdtdec_get_child_count(const void *blob, int node);
+
 /**
  * Look in the FDT for a config item with the given name and return its value
  * as a 32-bit integer. The property must have at least 4 bytes of data. The
@@ -831,6 +831,17 @@
 	return rc;
 }
  
+int fdtdec_get_child_count(const void *blob, int node)
+{
+	int subnode;
+	int num = 0;
+
+	fdt_for_each_subnode(blob, subnode, node)
+		num++;
+
+	return num;
+}
+
 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 		u8 *array, int count)
 {
...	...	@@ -722,6 +722,15 @@
722	722	*/
723	723	int fdtdec_get_bool(const void blob, int node, const char prop_name);
724	724
	725	+/*
	726	+ * Count child nodes of one parent node.
	727	+ *
	728	+ * @param blob FDT blob
	729	+ * @param node parent node
	730	+ * @return number of child node; 0 if there is not child node
	731	+ */
	732	+int fdtdec_get_child_count(const void *blob, int node);
	733	+
725	734	/**
726	735	* Look in the FDT for a config item with the given name and return its value
727	736	* as a 32-bit integer. The property must have at least 4 bytes of data. The
...	...	@@ -831,6 +831,17 @@
831	831	return rc;
832	832	}
833	833
	834	+int fdtdec_get_child_count(const void *blob, int node)
	835	+{
	836	+ int subnode;
	837	+ int num = 0;
	838	+
	839	+ fdt_for_each_subnode(blob, subnode, node)
	840	+ num++;
	841	+
	842	+ return num;
	843	+}
	844	+
834	845	int fdtdec_get_byte_array(const void blob, int node, const char prop_name,
835	846	u8 *array, int count)
836	847	{