"rpi-proto"-based overlay for the MikroElektronika 506 WM8731 dev board on the RockPi 4

rockpi-mikroe-506-overlay.dts

// rockpi-mikroe-506-overlay.dts
/dts-v1/;
/plugin/;

/ {

    compatible = "rockchip,rockpi","rockchip,rk3399";

    fragment@0 {
        target = <&i2s1>;
        __overlay__ {
            status = "okay";
        };
    };  

    fragment@1 {
        target = <&i2c7>;
        __overlay__ {
            #address-cells = <1>;
            #size-cells = <0>;
            status = "okay";

            wm8731@1a {
                #sound-dai-cells = <0>;
                compatible = "wlf,wm8731";
                reg = <0x1a>;
                status = "okay";
            };
        };
    };  

    fragment@2 {
        target-path = "/sound-ext-card";
        __overlay__ {
            compatible = "mikroe,506";
            i2s-controller = <&i2s1>;
            status = "okay";
        };
    };  

};