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Diffstat (limited to 'Documentation/devicetree/bindings/sound/audio-graph-scu-card.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/sound/audio-graph-scu-card.txt | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/audio-graph-scu-card.txt b/Documentation/devicetree/bindings/sound/audio-graph-scu-card.txt new file mode 100644 index 000000000000..8b8afe9fcb31 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/audio-graph-scu-card.txt @@ -0,0 +1,122 @@ +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"; + ... + }; + }; + }; + }; |