Research [RK3308] I2S output - device tree debugging

[ashthespy]

I have been playing around the Rock Pi S from radxa, and am stumbling at enabling the I2S output using a device tree overlay. (Building using current Armbain that uses @piter75's kernel branch)

As per the data sheet and pinout, `i2s_8ch_0` should be broken out to the GPIO, but I don't seem to be getting far enabling it via the device tree.
Any inputs?

This is what I am playing around with atm, but `dmesg` doesn't show anything helpful atm, and no "I2S-Card" device turns up.
Tried disabling the inbuilt audio codec ( connected to `i2s_8ch_2`), but still no dice.
The closest example I could find was from `rk3308-ai-va-v10.dts`, that similarly enables the `i2s_8ch_0`, but am unable to mimic it. 

/dts-v1/;
/plugin/;

/ {
        model = "Radxa ROCK Pi S";
        compatible = "radxa,rockpis-rk3308", "rockchip,rk3308";

        fragment@0 {
                target-path = "/";
                __overlay__ {
                        pcm5102a: pcm5102a {
                        #sound-dai-cells = <0>;
                        compatible = "ti,pcm5102a";
                        pcm510x,format = "i2s";
                        };
                };
        };

        fragment@1 {
                target = <&i2s_8ch_0>;
                __overlay__ {
                        status = "okay";
                        #sound-dai-cells = <0>;
                        sound-dai = <&pcm5102a>;
                };
        };

        fragment@2 {
                target-path = "/";
                __overlay__ {
                        sound_i2s {
                                compatible = "simple-audio-card";
                                simple-audio-card,name = "I2S-Card";
                                simple-audio-card,mclk-fs = <256>;
                                simple-audio-card,format = "i2s";
                                status = "okay";

                                simple-audio-card,dai-link {
                                        format = "i2s";
                                        codec {
                                            sound-dai = <&pcm5102a>;
                                        };
                                        cpu {
                                            sound-dai = <&i2s_8ch_0>;
                                        };
                                };
                        };
                };
        };
};