linux-kernel - Re: [PATCH RFC 3/3] arm64: dts: qcom: x1e78100-lenovo-thinkpad-t14s: add HDMI nodes

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Message-ID: <a38df652-54c0-4216-9aa5-c8d32599c8f7@oldschoolsolutions.biz>
Date: Sat, 6 Sep 2025 10:41:48 +0200
From: Jens Glathe <jens.glathe@...schoolsolutions.biz>
To: Neil Armstrong <neil.armstrong@...aro.org>, Vinod Koul
 <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 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>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 3/3] arm64: dts: qcom: x1e78100-lenovo-thinkpad-t14s:
 add HDMI nodes

On 21.08.25 15:53, Neil Armstrong wrote:
> The Thinkpad T14s embeds a transparent 4lanes DP->HDMI transceiver
> connected to the third QMP Combo PHY 4 lanes.
>
[...]
>   .../dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi    | 44 ++++++++++++++++++++++
>   1 file changed, 44 insertions(+)
[...]
> diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
> index 4cf61c2a34e31233b1adc93332bcabef22de3f86..5b62b8c3123633360f249e3ecdc8ea23f44e8e09 100644
> --- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
> +++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
[...]
> +&mdss_dp2 {
> +	status = "okay";
> +};
> +
> +&mdss_dp2_out {
> +	data-lanes = <0 1 2 3>;
> +};
> +

Hi Neil,

shouldn't mdss_dp2_out also have the link-frequencies property?

+    link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 
8100000000>;

Or is it something the bridge already negotiates?

with best regards

Jens