8 多 DAI 链路 - 单卡但多个子器件

-------------------------------------------
Example 2 - many DAI links:
-------------------------------------------
 
sound {
    compatible = "simple-audio-card";
    simple-audio-card,name = "Cubox Audio";
 
    simple-audio-card,dai-link@0 {      /* I2S - HDMI */
        reg = <0>;
        format = "i2s";
        cpu {
            sound-dai = <&audio1 0>;
        };
        codec {
            sound-dai = <&tda998x 0>;
        };
    };
 
    simple-audio-card,dai-link@1 {      /* S/PDIF - HDMI */
        reg = <1>;
        cpu {
            sound-dai = <&audio1 1>;
        };
        codec {
            sound-dai = <&tda998x 1>;
        };
    };
 
    simple-audio-card,dai-link@2 {      /* S/PDIF - S/PDIF */
        reg = <2>;
        cpu {
            sound-dai = <&audio1 1>;
        };
        codec {
            sound-dai = <&spdif_codec>;
        };
    };
};

参考资料：https://www.kernel.org/doc/Documentation/devicetree/bindings/sound/simple-card.txt