Rockpi S I2S masterclock

#1

I have done a lot of work with the the i2s interface on PiS and it works fine except one thing
It should output a masterclock on pin
68 PDM_CLK_M_M2 I2S0_8CH_MCLK GPIO2_A4 7
I use mostly the dummy-codec and it should output the master clock but it doesn’t regardless configuration.
I can in dmesg see “dummy-codec get mclk success” but still no master clock on the pin.
Is the hardware connection ok? something else I am missing?

#2

Heya - Can you post the dt overlay that you’re using? We maybe are looking in a similar direction, but for different reasons:

#3

Please look at my thread here

For TDM 8ch I believe you should use the dsp_b format
simple-audio-card,format = “dsp_b”;
That works fine for me with internal clock and standard codec.
// Definitions for DAC-8ch
/dts-v1/;
/plugin/;

/ {
compatible = “radxa,rockpis”, “rockchip,rk3308”;

    fragment@0 {
            target = <&i2s_8ch_0>;

            __overlay__ {
                    #sound-dai-cells = <0>;
                    status = "okay";
                    };
           };
           
    fragment@1 {
            target = <&i2s_8ch_2>;

            __overlay__ {
                    #sound-dai-cells = <0>;
                    status = "disabled";
                    };
           };

    fragment@2 {
            target-path = "/";

            __overlay__ {
                    pcm5102a {
                            #sound-dai-cells = <0>;
                            status = "okay";
                            };
                    sound {
                            simple-audio-card,name = "Multi-ch-DAC";
                            simple-audio-card,format = "dsp_b";
                            status = "okay";
                            
                            cpu {
                            dai-tdm-slot-num = <8>;
                            dai-tdm-slot-width = <16>;
                            };
                    };
             };
      };

};

#4

Its a while but when working I found the inputs noisey but here was what I used to use.

Never seemed to be an option as an overlay.
https://wiki.radxa.com/Device-tree-overlays