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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 1. Sampling Rate Conversion
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";
...
};
};
};
Example 2. 2 CPU 1 Codec (Mixing)
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_port0
&cpu_port1>;
};
audio-codec {
...
port {
codec_endpoint0: endpoint {
remote-endpoint = <&cpu_endpoint0>;
};
codec_endpoint1: endpoint {
remote-endpoint = <&cpu_endpoint1>;
};
};
};
dai-controller {
...
ports {
cpu_port0: port {
cpu_endpoint0: endpoint {
remote-endpoint = <&codec_endpoint0>;
dai-format = "left_j";
...
};
};
cpu_port1: port {
cpu_endpoint1: endpoint {
remote-endpoint = <&codec_endpoint1>;
dai-format = "left_j";
...
};
};
};
};
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