dac only config

........

sound {
        compatible = "simple-audio-card";
        simple-audio-card,name = "Audio-I2S";
        simple-audio-card,format = "i2s";
        simple-audio-card,bitclock-master = <&cpu_dai_master>;
        simple-audio-card,frame-master = <&cpu_dai_master>;

        simple-audio-card,widgets = "Speaker", "External Speaker";

        cpu_dai_master: simple-audio-card,cpu {
                sound-dai = <&i2s>;
        };

        dailink0_master: simple-audio-card,codec {
                sound-dai = <&codec_out>;
        };
};

codec_out: pcm5102a {
        #sound-dai-cells = <0>;
        #address-cells = <0>;
        #size-cells = <0>;
        compatible = "ti,pcm5102a";
        status = "okay";
};

.........

&i2s {
        #sound-dai-cells = <0>;
        status = "okay";
};