ASoC: add audio-graph-scu-card 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/audio-graph-scu-card.txt b/Documentation/devicetree/bindings/sound/audio-graph-scu-card.txt
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+Audio-Graph-SCU-Card:
+
+Audio-Graph-SCU-Card is "Audio-Graph-Card" + "ALSA DPCM".
+
+It is based on common bindings for device graphs.
+see ${LINUX}/Documentation/devicetree/bindings/graph.txt
+
+Basically, Audio-Graph-SCU-Card property is same as
+Simple-Card / Simple-SCU-Card / Audio-Graph-Card.
+see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt
+    ${LINUX}/Documentation/devicetree/bindings/sound/simple-scu-card.txt
+    ${LINUX}/Documentation/devicetree/bindings/sound/audio-graph-card.txt
+
+Below are same as Simple-Card / Audio-Graph-Card.
+
+- label
+- dai-format
+- frame-master
+- bitclock-master
+- bitclock-inversion
+- frame-inversion
+- dai-tdm-slot-num
+- dai-tdm-slot-width
+- clocks / system-clock-frequency
+
+Below are same as Simple-SCU-Card.
+
+- convert-rate
+- convert-channels
+- prefix
+- routing
+
+Required properties:
+
+- compatible                           : "audio-graph-scu-card";
+- dais                                 : list of CPU DAI port{s}
+
+Example
+
+       sound_card {
+               compatible = "audio-graph-scu-card";
+
+               label = "sound-card";
+               prefix = "codec";
+               routing = "codec Playback", "DAI0 Playback",
+                       "codec Playback", "DAI1 Playback";
+               convert-rate = <48000>;
+
+               dais = <&cpu_port>;
+       };
+
+       audio-codec {
+               ...
+
+               port {
+                       codec_endpoint: endpoint {
+                               remote-endpoint = <&cpu_endpoint>;
+                       };
+               };
+       };
+
+       dai-controller {
+               ...
+               cpu_port: port {
+                       cpu_endpoint: endpoint {
+                               remote-endpoint = <&codec_endpoint>;
+
+                               dai-format = "left_j";
+                               ...
+                       };
+               };
+       };