[media] v4l2-clk: add new macro for v4l2_clk_name_of()

This macro is used to generate an OF string for a v4l2 clock.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
index 5e1dc50..979ff9c 100644
--- a/drivers/media/platform/soc_camera/soc_camera.c
+++ b/drivers/media/platform/soc_camera/soc_camera.c
@@ -1678,8 +1678,8 @@
 		v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
 				  client->adapter->nr, client->addr);
 	else
-		snprintf(clk_name, sizeof(clk_name), "of-%s",
-			 of_node_full_name(remote));
+		v4l2_clk_name_of(clk_name, sizeof(clk_name),
+				 of_node_full_name(remote));
 
 	icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
 	if (IS_ERR(icd->clk)) {
diff --git a/include/media/v4l2-clk.h b/include/media/v4l2-clk.h
index 3ef6e3d..34891ea 100644
--- a/include/media/v4l2-clk.h
+++ b/include/media/v4l2-clk.h
@@ -68,4 +68,7 @@
 #define v4l2_clk_name_i2c(name, size, adap, client) snprintf(name, size, \
 			  "%d-%04x", adap, client)
 
+#define v4l2_clk_name_of(name, size, of_full_name) snprintf(name, size, \
+			  "of-%s", of_full_name)
+
 #endif