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 - dai-format - frame-master - bitclock-master - bitclock-inversion - frame-inversion - 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} 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"; ... }; }; }; };