[U-Boot] [PATCH] fdt: introudce fdt_get_child_count

[Peng Fan <van.freenix@gmail.com>]

Introudce fdt_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>
---
 include/libfdt.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/libfdt.h b/include/libfdt.h
index e48c21a..94d29e6 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -193,6 +193,24 @@ int fdt_next_subnode(const void *fdt, int offset);
 	     node >= 0;					\
 	     node = fdt_next_subnode(fdt, node))
 
+/**
+ * fdt_get_child_count() - get the number of subnodes of one node
+ *
+ * @fdt:	FDT blob
+ * @node:	Offset of node
+ * @return number of child nodes of node, or 0 if there is no subnode.
+ */
+static inline int fdt_get_child_count(void *fdt, int node)
+{
+	int subnode;
+	int num = 0;
+
+	fdt_for_each_subnode(fdt, subnode, node)
+		num++;
+
+	return num;
+}
+
 /**********************************************************************/
 /* General functions                                                  */
 /**********************************************************************/
-- 
2.6.2