ASoC: rsnd: add missing #sound-dai-cells explain on Document

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
index 1173395..776cf6a 100644 (file)
--- a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
+++ b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
@@ -30,6 +30,8 @@ Required properties:
 - rcar_sound,dai               : DAI contents.
                                  The number of DAI subnode should be same as HW.
                                  see below for detail.
+- #sound-dai-cells             : it must be 0 if your system is using single DAI
+                                 it must be 1 if your system is using multi  DAI
 
 SSI subnode properties:
 - interrupts                   : Should contain SSI interrupt for PIO transfer