linux-kernel - Re: [PATCH v3 7/7] arm64: dts: allwinner: pinephone: Set audio card name

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Message-ID: <2c8e512c-59f4-8869-be2e-0bf4c3cc2415@sholland.org>
Date:   Sun, 9 May 2021 20:54:36 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>
Subject: Re: [PATCH v3 7/7] arm64: dts: allwinner: pinephone: Set audio card
 name

On 5/7/21 3:09 AM, Maxime Ripard wrote:
> Hi,
> 
> On Thu, Apr 29, 2021 at 10:58:59PM -0500, Samuel Holland wrote:
>> From: Arnaud Ferraris <arnaud.ferraris@...labora.com>
>>
>> Add the "PinePhone" name to the sound card: this will make
>> upstreaming an ALSA UCM config easier as we can use a unique name.
>>
>> It also avoids an issue where the default card name is truncated.
>>
>> Signed-off-by: Arnaud Ferraris <arnaud.ferraris@...labora.com>
>> [Samuel: Split out change, updated commit message]
>> Signed-off-by: Samuel Holland <samuel@...lland.org>
>> ---
>>  arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
>> index 51cbfdc12936..02712f85f6bd 100644
>> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
>> @@ -433,6 +433,7 @@ &reg_rtc_ldo {
>>  
>>  &sound {
>>  	status = "okay";
>> +	simple-audio-card,name = "PinePhone";
>>  	simple-audio-card,aux-devs = <&codec_analog>, <&speaker_amp>;
>>  	simple-audio-card,widgets = "Microphone", "Headset Microphone",
>>  				    "Microphone", "Internal Microphone",
> 
> Isn't that reported to the userspace? I'm not sure we can just change it
> without breaking it.

Yes, this is seen by userspace.

Ideally, we would add this property with a unique value when enabling
audio for any board, but as you mention, it would be a breaking change
to add those properties now.

In practice, all distributions supporting the PinePhone are already
carrying this patch, because the ALSA setup needed for the PinePhone is
very different from most other boards. So it would be similarly breaking
for them (and their users) to drop this patch.

Regards,
Samuel