diff --git a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
index 648d43e1b1e9544fa1d30c909964406b8900a584..c58af457a8318e4123fdfbac74ed7b28c4f74433 100644
--- a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
+++ b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
@@ -282,7 +282,10 @@ Required properties:
 - reg				: Should contain the register physical address.
 				  required register is
 				   SRU/ADG/SSI      if generation1
-				   SRU/ADG/SSIU/SSI if generation2
+				   SRU/ADG/SSIU/SSI/AUDIO-DMAC-periperi if generation2/generation3
+- reg-names			: Should contain the register names.
+				   scu/adg/ssi	if generation1
+				   scu/adg/ssiu/ssi/audmapp if generation2/generation3
 - rcar_sound,ssi		: Should contain SSI feature.
 				  The number of SSI subnode should be same as HW.
 				  see below for detail.