linux-kernel - Re: [PATCH v2 5/5] arm64: dts: qcom: qcm6490-fairphone-fp5: Add DisplayPort sound support

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Message-ID: <q6eqlq4ltz6nnnqrja3obpv35qjbuqjqqj25ekcl5wgd4yubeq@gw3n6r44g32d>
Date: Sat, 19 Apr 2025 02:41:12 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Srinivas Kandagatla <srini@...nel.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        alsa-devel@...a-project.org, linux-arm-msm@...r.kernel.org,
        linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] arm64: dts: qcom: qcm6490-fairphone-fp5: Add
 DisplayPort sound support

On Fri, Apr 18, 2025 at 03:13:46PM +0200, Luca Weiss wrote:
> Add the required nodes for sound playback via a connected external
> display (DisplayPort over USB-C).
> 
> In user space just the following route needs to be set (e.g. using
> ALSA UCM):
> 
>   amixer -c0 cset name='DISPLAY_PORT_RX Audio Mixer MultiMedia1' 1
> 
> Afterwards one can play audio on the MultiMedia1 sound device, e.g.:
> 
>   aplay -D plughw:0,0 test.wav
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 31 ++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

-- 
With best wishes
Dmitry