124 lines
2.3 KiB
Plaintext
Executable file
124 lines
2.3 KiB
Plaintext
Executable file
Audio-Graph-SCU-Card:
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Audio-Graph-SCU-Card is "Audio-Graph-Card" + "ALSA DPCM".
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It is based on common bindings for device graphs.
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see ${LINUX}/Documentation/devicetree/bindings/graph.txt
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Basically, Audio-Graph-SCU-Card property is same as
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Simple-Card / Simple-SCU-Card / Audio-Graph-Card.
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see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt
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${LINUX}/Documentation/devicetree/bindings/sound/simple-scu-card.txt
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${LINUX}/Documentation/devicetree/bindings/sound/audio-graph-card.txt
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Below are same as Simple-Card / Audio-Graph-Card.
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- label
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- dai-format
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- frame-master
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- bitclock-master
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- bitclock-inversion
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- frame-inversion
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- dai-tdm-slot-num
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- dai-tdm-slot-width
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- clocks / system-clock-frequency
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Below are same as Simple-SCU-Card.
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- convert-rate
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- convert-channels
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- prefix
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- routing
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Required properties:
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- compatible : "audio-graph-scu-card";
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- dais : list of CPU DAI port{s}
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Example 1. Sampling Rate Conversion
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sound_card {
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compatible = "audio-graph-scu-card";
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label = "sound-card";
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prefix = "codec";
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routing = "codec Playback", "DAI0 Playback",
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"DAI0 Capture", "codec Capture";
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convert-rate = <48000>;
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dais = <&cpu_port>;
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};
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audio-codec {
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...
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port {
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codec_endpoint: endpoint {
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remote-endpoint = <&cpu_endpoint>;
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};
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};
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};
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dai-controller {
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...
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cpu_port: port {
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cpu_endpoint: endpoint {
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remote-endpoint = <&codec_endpoint>;
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dai-format = "left_j";
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...
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};
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};
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};
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Example 2. 2 CPU 1 Codec (Mixing)
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sound_card {
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compatible = "audio-graph-scu-card";
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label = "sound-card";
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prefix = "codec";
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routing = "codec Playback", "DAI0 Playback",
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"codec Playback", "DAI1 Playback",
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"DAI0 Capture", "codec Capture";
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convert-rate = <48000>;
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dais = <&cpu_port0
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&cpu_port1>;
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};
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audio-codec {
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...
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port {
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codec_endpoint0: endpoint {
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remote-endpoint = <&cpu_endpoint0>;
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};
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codec_endpoint1: endpoint {
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remote-endpoint = <&cpu_endpoint1>;
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};
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};
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};
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dai-controller {
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...
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ports {
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cpu_port0: port {
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cpu_endpoint0: endpoint {
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remote-endpoint = <&codec_endpoint0>;
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dai-format = "left_j";
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...
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};
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};
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cpu_port1: port {
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cpu_endpoint1: endpoint {
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remote-endpoint = <&codec_endpoint1>;
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dai-format = "left_j";
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...
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};
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};
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};
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};
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