ASoC: rsnd: add TDM Split mode support for Document (cf704dc8) · Commits · 戴 / test

Documentation/devicetree/bindings/sound/renesas,rsnd.txt

+91 −0

Original line number	Diff line number	Diff line
		@@ -188,6 +188,25 @@ In DMA mode, you can select not to use SSIU by using "no-busif" via SSI.
		SSIU handles BUSIF which will be used for TDM Split mode.
		This driver is assuming that audio-graph card will be used.

		TDM Split mode merges 4 sounds. You can see 4 sound interface on system,
		and these sounds will be merged SSIU/SSI.

		aplay -D plughw:0,0 xxxx.wav &
		aplay -D plughw:0,1 xxxx.wav &
		aplay -D plughw:0,2 xxxx.wav &
		aplay -D plughw:0,3 xxxx.wav

		2ch 8ch
		[MEM] -> [SSIU 30] -+-> [SSIU 3] --> [Codec]
		2ch \|
		[MEM] -> [SSIU 31] -+
		2ch \|
		[MEM] -> [SSIU 32] -+
		2ch \|
		[MEM] -> [SSIU 33] -+

		see "Example: simple sound card for TDM Split"

		=============================================
		* SSI (Serial Sound Interface)
		=============================================
		@@ -648,6 +667,78 @@ rsnd_tdm: sound {
		};
		};

		=============================================
		Example: simple sound card for TDM Split
		=============================================

		sound_card: sound {
		compatible = "audio-graph-scu-card";
		prefix = "xxxx";
		routing = "xxxx Playback", "DAI0 Playback",
		"xxxx Playback", "DAI1 Playback",
		"xxxx Playback", "DAI2 Playback",
		"xxxx Playback", "DAI3 Playback";
		convert-channels = <8>; /* TDM Split */

		dais = <&rsnd_port0 /* playback ch1/ch2 */
		&rsnd_port1 /* playback ch3/ch4 */
		&rsnd_port2 /* playback ch5/ch6 */
		&rsnd_port3 /* playback ch7/ch8 */
		>;
		};

		audio-codec {
		...
		port {
		codec_0: endpoint@1 {
		remote-endpoint = <&rsnd_ep0>;
		};
		codec_1: endpoint@2 {
		remote-endpoint = <&rsnd_ep1>;
		};
		codec_2: endpoint@3 {
		remote-endpoint = <&rsnd_ep2>;
		};
		codec_3: endpoint@4 {
		remote-endpoint = <&rsnd_ep3>;
		};
		};
		};

		&rcar_sound {
		...
		ports {
		rsnd_port0: port@0 {
		rsnd_ep0: endpoint {
		remote-endpoint = <&codec_0>;
		...
		playback = <&ssiu30 &ssi3>;
		};
		};
		rsnd_port1: port@1 {
		rsnd_ep1: endpoint {
		remote-endpoint = <&codec_1>;
		...
		playback = <&ssiu31 &ssi3>;
		};
		};
		rsnd_port2: port@2 {
		rsnd_ep2: endpoint {
		remote-endpoint = <&codec_2>;
		...
		playback = <&ssiu32 &ssi3>;
		};
		};
		rsnd_port3: port@3 {
		rsnd_ep3: endpoint {
		remote-endpoint = <&codec_3>;
		...
		playback = <&ssiu33 &ssi3>;
		};
		};
		};
		};

		=============================================
		Example: simple sound card for Multi channel
		=============================================

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