linux-kernel - Re: [PATCH 08/16] arm64: dts: allwinner: h6: Add HDMI audio node

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Message-ID: <20200706052937.ygjjllrsj7rvynkq@gilmour.lan>
Date:   Mon, 6 Jul 2020 07:29:37 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 08/16] arm64: dts: allwinner: h6: Add HDMI audio node

Hi,

On Sat, Jul 04, 2020 at 01:38:54PM +0200, Clément Péron wrote:
> From: Jernej Skrabec <jernej.skrabec@...l.net>
> 
> Add a simple-soundcard to link audio between HDMI and I2S.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 33 ++++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> index 78b1361dfbb9..ae169d07b939 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> @@ -67,6 +67,25 @@ de: display-engine {
>  		status = "disabled";
>  	};
>  
> +	hdmi_sound: hdmi-sound {
> +		compatible = "simple-audio-card";
> +		simple-audio-card,format = "i2s";
> +		simple-audio-card,name = "sun50i-h6-hdmi";
> +		simple-audio-card,mclk-fs = <128>;
> +		simple-audio-card,frame-inversion;

Have you figured that one out?

> +		status = "disabled";
> +
> +		simple-audio-card,codec {
> +			sound-dai = <&hdmi>;
> +		};
> +
> +		simple-audio-card,cpu {
> +			sound-dai = <&i2s1>;
> +			dai-tdm-slot-num = <2>;
> +			dai-tdm-slot-width = <32>;

I'm not sure why you need to use the TDM stuff here. IIRC the HDMI
controller can output on up to 6 channels, so how would that work out?

Maxime

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