Audio Graph Card:
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Audio Graph Card specifies audio DAI connections of SoC <-> codec.
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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 Card property is same as Simple Card.
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see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt
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Below are same as Simple-Card.
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- label
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- widgets
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- routing
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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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- mclk-fs
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- hp-det-gpio
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- mic-det-gpio
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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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Required properties:
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- compatible : "audio-graph-card";
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- dais : list of CPU DAI port{s}
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Optional properties:
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- pa-gpios: GPIO used to control external amplifier.
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Example: Single DAI case
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sound_card {
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compatible = "audio-graph-card";
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dais = <&cpu_port>;
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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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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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Example: Multi DAI case
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sound-card {
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compatible = "audio-graph-card";
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label = "sound-card";
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dais = <&cpu_port0
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&cpu_port1
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&cpu_port2>;
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};
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audio-codec@0 {
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...
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port {
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codec0_endpoint: endpoint {
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remote-endpoint = <&cpu_endpoint0>;
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};
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};
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};
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audio-codec@1 {
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...
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port {
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codec1_endpoint: 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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audio-codec@2 {
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...
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port {
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codec2_endpoint: endpoint {
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remote-endpoint = <&cpu_endpoint2>;
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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@0 {
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cpu_endpoint0: endpoint {
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remote-endpoint = <&codec0_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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cpu_port1: port@1 {
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cpu_endpoint1: endpoint {
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remote-endpoint = <&codec1_endpoint>;
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dai-format = "i2s";
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...
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};
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};
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cpu_port2: port@2 {
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cpu_endpoint2: endpoint {
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remote-endpoint = <&codec2_endpoint>;
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dai-format = "i2s";
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...
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};
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};
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};
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};
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