ASoC: simple-scu-card: add 2 CPU 1 Codec example

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

Documentation/devicetree/bindings/sound/simple-scu-card.txt

@@ -52,7 +52,7 @@ Optional CPU/CODEC subnodes properties:
 					  clk_disable_unprepare() in dai
 					  shutdown().
 
-Example
+Example 1. Sampling Rate Covert
 
 sound {
 	compatible = "simple-scu-audio-card";
@@ -78,3 +78,33 @@ sound {
 		system-clock-frequency = <11289600>;
 	};
 };
+
+Example 2. 2 CPU 1 Codec
+
+sound {
+	compatible = "renesas,rsrc-card";
+
+	card-name = "rsnd-ak4643";
+	format = "left_j";
+	bitclock-master = <&dpcmcpu>;
+	frame-master = <&dpcmcpu>;
+
+	convert-rate = <48000>;  /* see audio_clk_a */
+
+	audio-prefix = "ak4642";
+	audio-routing = "ak4642 Playback", "DAI0 Playback",
+			"ak4642 Playback", "DAI1 Playback";
+
+	dpcmcpu: cpu@0 {
+		sound-dai = <&rcar_sound 0>;
+	};
+
+	cpu@1 {
+		sound-dai = <&rcar_sound 1>;
+	};
+
+	codec {
+		sound-dai = <&ak4643>;
+		clocks = <&audio_clock>;
+	};
+};