diff --git a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
index 7c6d33f297968d656ac82bfd7fb26da12cc6f2e1..a44e9179faf569c7d8f40ab317381d2728398f99 100644
--- a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
+++ b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
@@ -7,14 +7,23 @@ Required properties:
 				  required register is
 				   SRU/ADG/SSI      if generation1
 				   SRU/ADG/SSIU/SSI if generation2
-- rcar_sound,ssi		: SSI subnode
-- rcar_sound,scu		: SCU subnode
-- rcar_sound,dai		: DAI subnode
+- rcar_sound,ssi		: Should contain SSI feature.
+				  The number of SSI subnode should be same as HW.
+				  see below for detail.
+- rcar_sound,src		: Should contain SRC feature.
+				  The number of SRC subnode should be same as HW.
+				  see below for detail.
+- rcar_sound,dai		: DAI contents.
+				  The number of DAI subnode should be same as HW.
+				  see below for detail.
 
 SSI subnode properties:
 - interrupts			: Should contain SSI interrupt for PIO transfer
 - shared-pin			: if shared clock pin
 
+SRC subnode properties:
+no properties at this point
+
 DAI subnode properties:
 - playback			: list of playback modules
 - capture			: list of capture  modules