ASoC: rsnd: add MIX (Mixer) support

This patch adds MIX (Mixer) initial support for rsnd driver.
It is assuming that this MIX is used via DPCM.

This is sample code for playback.

	CPU0  : [MEM] -> [SRC1] -> [CTU02] -+
					    |
					    +-> [MIX0] -> [DVC0] -> [SSI0]
	                                    |
	CPU1  : [MEM] -> [SRC2] -> [CTU03] -+

	sound {
		compatible = "renesas,rsrc-card";

		...

		cpu@0 {
			sound-dai = <&rcar_sound 0>;
		};

		cpu@1 {
			sound-dai = <&rcar_sound 1>;
		};

		codec {
			...
		};
	};

	rcar_sound {

		...

		rcar_sound,dai {
			dai0 {
				playback = <&src1 &ctu02 &mix0 &dvc0 &ssi0>;
			};
			dai1 {
				playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>;
			};
		};
	};

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
index 278607de05de..1173395b5e5c 100644
--- a/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
+++ b/Documentation/devicetree/bindings/sound/renesas,rsnd.txt
@@ -21,6 +21,9 @@ Required properties:
 - rcar_sound,ctu		: Should contain CTU feature.
 				  The number of CTU subnode should be same as HW.
 				  see below for detail.
+- rcar_sound,mix		: Should contain MIX feature.
+				  The number of MIX subnode should be same as HW.
+				  see below for detail.
 - rcar_sound,dvc		: Should contain DVC feature.
 				  The number of DVC subnode should be same as HW.
 				  see below for detail.
@@ -93,6 +96,11 @@ rcar_sound: sound@ec500000 {
 		};
 	};
 
+	rcar_sound,mix {
+		mix0: mix@0 { };
+		mix1: mix@1 { };
+	};
+
 	rcar_sound,ctu {
 		ctu00: ctu@0 { };
 		ctu01: ctu@1 { };