On Sat, Jul 04, 2020 at 01:38:59PM +0200, Clément Péron wrote:
> From: Marcus Cooper <codekipper@gmail.com>
> 
> Add a simple-soundcard to link audio between HDMI and I2S.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> Signed-off-by: Marcus Cooper <codekipper@gmail.com>
> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 21 +++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index c662f6a170ce..6a321fdc8e90 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -102,6 +102,25 @@ de: display-engine {
>  		status = "disabled";
>  	};
>  
> +	hdmi_sound: hdmi-sound {
> +		compatible = "simple-audio-card";
> +		simple-audio-card,format = "i2s";
> +		simple-audio-card,name = "sun50i-a64-hdmi";
> +		simple-audio-card,mclk-fs = <128>;
> +		simple-audio-card,frame-inversion;
> +		status = "disabled";
> +
> +		simple-audio-card,codec {
> +			sound-dai = <&hdmi>;
> +		};
> +
> +		simple-audio-card,cpu {
> +			sound-dai = <&i2s2>;
> +			dai-tdm-slot-num = <2>;
> +			dai-tdm-slot-width = <32>;
> +		};
> +	};
> +
>  	osc24M: osc24M_clk {
>  		#clock-cells = <0>;
>  		compatible = "fixed-clock";
> @@ -856,6 +875,7 @@ i2s2: i2s@1c22800 {
>  			resets = <&ccu RST_BUS_I2S2>;
>  			dma-names = "tx";
>  			dmas = <&dma 27>;
> +			allwinner,playback-channels = <8>;

This isn't documented anywhere

Maxime