linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: x1p42100-lenovo-thinkbook-16: add hdmi bridge with enable pin

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Message-ID: <124d3c41-1826-4927-b4de-1d2d1ccaf5d4@oldschoolsolutions.biz>
Date: Sun, 21 Dec 2025 09:03:30 +0100
From: Jens Glathe <jens.glathe@...schoolsolutions.biz>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Val Packett <val@...kett.cool>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: x1p42100-lenovo-thinkbook-16: add
 hdmi bridge with enable pin

On 21.12.25 03:49, Dmitry Baryshkov wrote:
> Photos / scans of the mainboard?
Haven't found good ones where you could even see a chip (let alone 
markings) in the vicinity of the hdmi connector.
> Okay, I might be misunderstanding something. What do you mean here by
> "gpio119 being used twice"?

/me trying to explain something and confusing people :) Sorry for that. 
The whole dts has actually one place where the TLMM 119 is explicitly 
specified, on the hdmi-bridge. It is defined again on the tlmm node for 
pinctrl as hdmi_bridge_en (function gpio), so far so normal. gpio 119 
(on the TLMM) is also defined and used as edp_hpd_default on the 
mdss_dp3 node, there with function edp0_hot.

You need the hdmi_bridge_en and the edp_hpd definition in the dts for 
both to work. And both use gpio 119, on the TLMM, which might be a bit 
confusing.

with best regards

Jens