| Audio Graph Card: |
| |
| Audio Graph Card specifies audio DAI connections of SoC <-> codec. |
| It is based on common bindings for device graphs. |
| see ${LINUX}/Documentation/devicetree/bindings/graph.txt |
| |
| Basically, Audio Graph Card property is same as Simple Card. |
| see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt |
| |
| Below are same as Simple-Card. |
| |
| - label |
| - widgets |
| - routing |
| - dai-format |
| - frame-master |
| - bitclock-master |
| - bitclock-inversion |
| - frame-inversion |
| - mclk-fs |
| - hp-det-gpio |
| - mic-det-gpio |
| - dai-tdm-slot-num |
| - dai-tdm-slot-width |
| - clocks / system-clock-frequency |
| |
| Required properties: |
| |
| - compatible : "audio-graph-card"; |
| - dais : list of CPU DAI port{s} |
| |
| Optional properties: |
| - pa-gpios: GPIO used to control external amplifier. |
| |
| ----------------------- |
| Example: Single DAI case |
| ----------------------- |
| |
| sound_card { |
| compatible = "audio-graph-card"; |
| |
| dais = <&cpu_port>; |
| }; |
| |
| dai-controller { |
| ... |
| cpu_port: port { |
| cpu_endpoint: endpoint { |
| remote-endpoint = <&codec_endpoint>; |
| |
| dai-format = "left_j"; |
| ... |
| }; |
| }; |
| }; |
| |
| audio-codec { |
| ... |
| port { |
| codec_endpoint: endpoint { |
| remote-endpoint = <&cpu_endpoint>; |
| }; |
| }; |
| }; |
| |
| ----------------------- |
| Example: Multi DAI case |
| ----------------------- |
| |
| sound-card { |
| compatible = "audio-graph-card"; |
| |
| label = "sound-card"; |
| |
| dais = <&cpu_port0 |
| &cpu_port1 |
| &cpu_port2>; |
| }; |
| |
| audio-codec@0 { |
| ... |
| port { |
| codec0_endpoint: endpoint { |
| remote-endpoint = <&cpu_endpoint0>; |
| }; |
| }; |
| }; |
| |
| audio-codec@1 { |
| ... |
| port { |
| codec1_endpoint: endpoint { |
| remote-endpoint = <&cpu_endpoint1>; |
| }; |
| }; |
| }; |
| |
| audio-codec@2 { |
| ... |
| port { |
| codec2_endpoint: endpoint { |
| remote-endpoint = <&cpu_endpoint2>; |
| }; |
| }; |
| }; |
| |
| dai-controller { |
| ... |
| ports { |
| cpu_port0: port@0 { |
| cpu_endpoint0: endpoint { |
| remote-endpoint = <&codec0_endpoint>; |
| |
| dai-format = "left_j"; |
| ... |
| }; |
| }; |
| cpu_port1: port@1 { |
| cpu_endpoint1: endpoint { |
| remote-endpoint = <&codec1_endpoint>; |
| |
| dai-format = "i2s"; |
| ... |
| }; |
| }; |
| cpu_port2: port@2 { |
| cpu_endpoint2: endpoint { |
| remote-endpoint = <&codec2_endpoint>; |
| |
| dai-format = "i2s"; |
| ... |
| }; |
| }; |
| }; |
| }; |
| |
| |
| ----------------------- |
| Example: Sampling Rate Conversion |
| ----------------------- |
| |
| sound_card { |
| compatible = "audio-graph-card"; |
| |
| label = "sound-card"; |
| prefix = "codec"; |
| routing = "codec Playback", "DAI0 Playback", |
| "DAI0 Capture", "codec Capture"; |
| 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 CPU 1 Codec (Mixing) |
| ----------------------- |
| |
| sound_card { |
| compatible = "audio-graph-card"; |
| |
| label = "sound-card"; |
| routing = "codec Playback", "DAI0 Playback", |
| "codec Playback", "DAI1 Playback", |
| "DAI0 Capture", "codec Capture"; |
| |
| dais = <&cpu_port>; |
| }; |
| |
| audio-codec { |
| ... |
| |
| audio-graph-card,prefix = "codec"; |
| audio-graph-card,convert-rate = <48000>; |
| port { |
| reg = <0>; |
| codec_endpoint0: endpoint@0 { |
| remote-endpoint = <&cpu_endpoint0>; |
| }; |
| codec_endpoint1: endpoint@1 { |
| remote-endpoint = <&cpu_endpoint1>; |
| }; |
| }; |
| }; |
| |
| dai-controller { |
| ... |
| cpu_port: port { |
| cpu_endpoint0: endpoint@0 { |
| remote-endpoint = <&codec_endpoint0>; |
| |
| dai-format = "left_j"; |
| ... |
| }; |
| cpu_endpoint1: endpoint@1 { |
| remote-endpoint = <&codec_endpoint1>; |
| |
| dai-format = "left_j"; |
| ... |
| }; |
| }; |
| }; |
| |
| ----------------------- |
| Example: Multi DAI with DPCM |
| ----------------------- |
| |
| CPU0 ------ ak4613 |
| CPU1 ------ HDMI |
| CPU2 ------ PCM3168A-p /* DPCM 1ch/2ch */ |
| CPU3 --/ /* DPCM 3ch/4ch */ |
| CPU4 --/ /* DPCM 5ch/6ch */ |
| CPU5 --/ /* DPCM 7ch/8ch */ |
| CPU6 ------ PCM3168A-c |
| |
| sound_card: sound { |
| compatible = "audio-graph-card"; |
| |
| label = "sound-card"; |
| |
| routing = "pcm3168a Playback", "DAI2 Playback", |
| "pcm3168a Playback", "DAI3 Playback", |
| "pcm3168a Playback", "DAI4 Playback", |
| "pcm3168a Playback", "DAI5 Playback"; |
| |
| dais = <&snd_port0 /* ak4613 */ |
| &snd_port1 /* HDMI0 */ |
| &snd_port2 /* pcm3168a playback */ |
| &snd_port3 /* pcm3168a capture */ |
| >; |
| }; |
| |
| ak4613: codec@10 { |
| ... |
| port { |
| ak4613_endpoint: endpoint { |
| remote-endpoint = <&rsnd_endpoint0>; |
| }; |
| }; |
| }; |
| |
| pcm3168a: audio-codec@44 { |
| ... |
| audio-graph-card,prefix = "pcm3168a"; |
| audio-graph-card,convert-channels = <8>; /* TDM Split */ |
| ports { |
| port@0 { |
| reg = <0>; |
| pcm3168a_endpoint_p1: endpoint@1 { |
| remote-endpoint = <&rsnd_endpoint2>; |
| ... |
| }; |
| pcm3168a_endpoint_p2: endpoint@2 { |
| remote-endpoint = <&rsnd_endpoint3>; |
| ... |
| }; |
| pcm3168a_endpoint_p3: endpoint@3 { |
| remote-endpoint = <&rsnd_endpoint4>; |
| ... |
| }; |
| pcm3168a_endpoint_p4: endpoint@4 { |
| remote-endpoint = <&rsnd_endpoint5>; |
| ... |
| }; |
| }; |
| port@1 { |
| reg = <1>; |
| pcm3168a_endpoint_c: endpoint { |
| remote-endpoint = <&rsnd_endpoint6>; |
| ... |
| }; |
| }; |
| }; |
| }; |
| |
| &sound { |
| ports { |
| snd_port0: port@0 { |
| rsnd_endpoint0: endpoint { |
| remote-endpoint = <&ak4613_endpoint>; |
| ... |
| }; |
| }; |
| snd_port1: port@1 { |
| rsnd_endpoint1: endpoint { |
| remote-endpoint = <&dw_hdmi0_snd_in>; |
| ... |
| }; |
| }; |
| snd_port2: port@2 { |
| #address-cells = <1>; |
| #size-cells = <0>; |
| rsnd_endpoint2: endpoint@2 { |
| remote-endpoint = <&pcm3168a_endpoint_p1>; |
| ... |
| }; |
| rsnd_endpoint3: endpoint@3 { |
| remote-endpoint = <&pcm3168a_endpoint_p2>; |
| ... |
| }; |
| rsnd_endpoint4: endpoint@4 { |
| remote-endpoint = <&pcm3168a_endpoint_p3>; |
| ... |
| }; |
| rsnd_endpoint5: endpoint@5 { |
| remote-endpoint = <&pcm3168a_endpoint_p4>; |
| ... |
| }; |
| }; |
| snd_port3: port@6 { |
| rsnd_endpoint6: endpoint { |
| remote-endpoint = <&pcm3168a_endpoint_c>; |
| ... |
| }; |
| }; |
| }; |
| }; |