linux-kernel - Re: [PATCH 4/7] arm64: dts: allwinner: a64: Add HDMI audio

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Date:   Tue, 28 Apr 2020 10:00:20 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [PATCH 4/7] arm64: dts: allwinner: a64: Add HDMI audio

On Sun, Apr 26, 2020 at 02:04:39PM +0200, Clément Péron wrote:
> From: Marcus Cooper <codekipper@...il.com>
> 
> 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-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 e56e1e3d4b73..08ab6b5e72a5 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -102,6 +102,25 @@
>  		status = "disabled";
>  	};
>  
> +	hdmi_sound: hdmi-sound {
> +		compatible = "simple-audio-card";
> +		simple-audio-card,format = "i2s";
> +		simple-audio-card,name = "allwinner,hdmi";

I'm not sure what the usual card name should be like though. I would assume that
this should be something specific enough so that you're able to differentiate
between boards / SoC so that the userspace can choose a different configuration
based on it?

If so, it's really too generic.

Maxime

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