Re: [PATCH v2 1/2] arm64: dts: qcom: sc8280xp-microsoft-blackrock: Replace old sound nodes, enable DisplayPort audio

[Jens Glathe]

Hi Bjorn,

On 9/29/26 05:13, Bjorn Andersson wrote:
> On Tue, Aug 25, 2026 at 04:07:45PM +0200, Jens Glathe via B4 Relay wrote:
> > From: Jens Glathe<jens.glathe@xxxxxxxxxxxxxxxxxxxxxx>
> >
> > The Windows Dev Kit 2023 has no built-in speakers, microphones or
> > headphone jack. Likewise the device with the same mainboard, Surface
> > Pro 9 5G [1]. The previous WCD938x / WSA / VA sound card definition
> > was therefore non-functional.
> >
> > Replace the unused codec nodes, SoundWire controllers, LPASS macros
> > and related pinctrl with DisplayPort DAI links (DP0/DP1/DP2) so that
> > audio is available over the DP connectors. Add the required
> > sound-name-prefix properties and update the card model name to the
> > conventional SC8280XP-MICROSOFT-BLACKROCK form.
> >
> > [1]:https://support.microsoft.com/en-us/surface/models/surface-pro-9-features-and-specs
> Computer says:
>
> arch/arm64/boot/dts/qcom/sc8280xp-crd-el2.dtb: displayport-controller@aea0000 (qcom,sc8280xp-edp): Unevaluated properties are not allowed ('sound-name-prefix' was unexpected)
>      from schema $id:http://devicetree.org/schemas/display/msm/dp-controller.yaml
> + 5 more times...

Ouch. EDP has no sound node, it explicitly gets deleted. In 
sc8280xp.dtsi the compatible for mdss0_dp3 is "qcom,sc8280xp-dp", 
though. Therefore I added the sound-name-prefix there, too. I guess 
adding the sound-name-prefixes in the .dtsi is only semi-good. So the 
way forward (without changing all the sc8280xp-based dts files ) would 
be to keep sound-name-prefix in the dts and live with that? Specifically 
omitting sound-name-prefix in mdss0_dp3 is the worse choice, IMO.

with best regards

Jens