ASoC Simple SCU Sound Card
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Simple SCU Sound Card is "Simple Sound Card" + "ALSA DPCM".
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For example, you can use this driver if you want to exchange sampling rate convert,
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Mixing, etc...
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Required properties:
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- compatible : "simple-scu-audio-card"
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"renesas,rsrc-card"
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Optional properties:
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- simple-audio-card,name : see simple-audio-card.txt
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- simple-audio-card,cpu : see simple-audio-card.txt
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- simple-audio-card,codec : see simple-audio-card.txt
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Optional subnode properties:
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- simple-audio-card,format : see simple-audio-card.txt
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- simple-audio-card,frame-master : see simple-audio-card.txt
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- simple-audio-card,bitclock-master : see simple-audio-card.txt
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- simple-audio-card,bitclock-inversion : see simple-audio-card.txt
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- simple-audio-card,frame-inversion : see simple-audio-card.txt
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- simple-audio-card,convert-rate : platform specified sampling rate convert
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- simple-audio-card,convert-channels : platform specified converted channel size (2 - 8 ch)
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- simple-audio-card,prefix : see routing
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- simple-audio-card,widgets : Please refer to widgets.txt.
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- simple-audio-card,routing : A list of the connections between audio components.
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Each entry is a pair of strings, the first being the connection's sink,
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the second being the connection's source. Valid names for sources.
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use audio-prefix if some components is using same sink/sources naming.
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it can be used if compatible was "renesas,rsrc-card";
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Required CPU/CODEC subnodes properties:
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- sound-dai : see simple-audio-card.txt
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Optional CPU/CODEC subnodes properties:
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- clocks / system-clock-frequency : see simple-audio-card.txt
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Example 1. Sampling Rate Conversion
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sound {
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compatible = "simple-scu-audio-card";
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simple-audio-card,name = "rsnd-ak4643";
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simple-audio-card,format = "left_j";
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simple-audio-card,bitclock-master = <&sndcodec>;
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simple-audio-card,frame-master = <&sndcodec>;
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simple-audio-card,convert-rate = <48000>;
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simple-audio-card,prefix = "ak4642";
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simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
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"DAI0 Capture", "ak4642 Capture";
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sndcpu: simple-audio-card,cpu {
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sound-dai = <&rcar_sound>;
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};
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sndcodec: simple-audio-card,codec {
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sound-dai = <&ak4643>;
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system-clock-frequency = <11289600>;
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};
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};
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Example 2. 2 CPU 1 Codec (Mixing)
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sound {
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compatible = "simple-scu-audio-card";
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simple-audio-card,name = "rsnd-ak4643";
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simple-audio-card,format = "left_j";
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simple-audio-card,bitclock-master = <&dpcmcpu>;
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simple-audio-card,frame-master = <&dpcmcpu>;
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simple-audio-card,prefix = "ak4642";
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simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
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"ak4642 Playback", "DAI1 Playback";
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dpcmcpu: cpu@0 {
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sound-dai = <&rcar_sound 0>;
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};
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cpu@1 {
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sound-dai = <&rcar_sound 1>;
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};
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codec {
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sound-dai = <&ak4643>;
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clocks = <&audio_clock>;
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};
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};
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