问题
    [    9.475500]  2034000.daudio-pcm512x-hifi: pcm new capture failed with err=-14
    [    9.483492]  2034000.daudio-pcm512x-hifi: ASoC: pcm constructor failed: -14
    [    9.491279] sunxi-audio-card 20340a0.sounddaudio2: ASoC: can't create pcm 2034000.daudio-pcm512x-hifi :-14


    #aplay -D hw:3 cuanqi.wav 
    [ 1605.453045] pcm512x 2-004c: Need SCLK for master mode: -2
    [ 1605.459096] pcm512x 2-004c: ASoC: can't open codec pcm512x-hifi: -2

    pcm512x: pcm512x@4c {
                compatible = "ti,pcm5121";
                /*pcm512x,format = "i2s";*/
                #sound-dai-cells = <0>;
                reg = <0x4c>;			
                AVDD-supply = <&reg_pio3_3>;
                DVDD-supply = <&reg_pio3_3>;
                CPVDD-supply = <&reg_pio3_3>;
                status = "okay";
        };


    &daudio2 {
        mclk_div 	= <0x80>;
        frametype 	= <0x00>;
        tdm_config 	= <0x01>;
        sign_extend 	= <0x00>;
        tx_data_mode 	= <0x00>;
        rx_data_mode 	= <0x00>;
        msb_lsb_first 	= <0x00>;
        pcm_lrck_period = <0x80>;
        slot_width_select = <0x18>;
        asrc_function_en  = <0x00>;
        pinctrl-names   = "default", "sleep";
        pinctrl-0       = <&daudio2_pins_a>;
        pinctrl-1       = <&daudio2_pins_b>;
        pinctrl_used	= <0x1>;
        daudio_type	= <0x0>;
        status = "okay";
    };

    /* if HDMI audio is used, daudio2 should be enable. */
    &hdmiaudio {
        status = "disabled";
    };

    &sounddaudio2 {
        status = "okay";
        simple-audio-card,name = "pcm512x";
        simple-audio-card,format = "i2s";
        simple-audio-card,codec {
            sound-dai = <&pcm512x>;
        };
    };