linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: x1e78100-t14s: Add audio playback over DisplayPort

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Message-ID: <a3808dca-2356-4871-83e8-c535cd0cce86@linaro.org>
Date: Mon, 27 Oct 2025 13:38:01 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Rob Clark <robin.clark@....qualcomm.com>, Dmitry Baryshkov
 <lumag@...nel.org>, Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Jessica Zhang <jessica.zhang@....qualcomm.com>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Kuogee Hsieh <quic_khsieh@...cinc.com>, linux-arm-msm@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: x1e78100-t14s: Add audio playback
 over DisplayPort

On 27/10/2025 13:20, Konrad Dybcio wrote:
> On 10/21/25 1:10 PM, Krzysztof Kozlowski wrote:
>> Add necessary DAI links and DAI name prefixes to enable audio playback
>> over USB/DisplayPort and HDMI.  The HDMI port is not yet enabled, but it
>> should carry respective DAI name prefix regardless.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>
>> ---
>>
>> ALSA UCM and audioreach topology will follow up as well.
>> ---
> 
> [...]
> 
>>  &mdss_dp0 {
>> +	sound-name-prefix = "DisplayPort0";
> 
> We should probably push this into SoC dtsi since #sound-dai-cells
> is there


Hm, that's important for user-space and represents actual naming or
wiring on the board, so it is strictly a board property. IOW, there
could be a board which does not have DP0, thus mdss_dp1 should be called
DP0.

If you are sure that such case does not exist, then indeed we can make
it shared.

Best regards,
Krzysztof