linux-kernel - [PATCH v2 2/4] arm64: dts: qcom: x1e78100-t14s: add hpd gpio to LCD panel

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Message-Id: <20250325-wip-obbardc-qcom-t14s-oled-panel-v2-2-e9bc7c9d30cc@linaro.org>
Date: Tue, 25 Mar 2025 19:21:27 +0000
From: Christopher Obbard <christopher.obbard@...aro.org>
To: Douglas Anderson <dianders@...omium.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 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>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, Johan Hovold <johan@...nel.org>, 
 Rui Miguel Silva <rui.silva@...aro.org>, Abel Vesa <abel.vesa@...aro.org>, 
 devicetree@...r.kernel.org, 
 Christopher Obbard <christopher.obbard@...aro.org>
Subject: [PATCH v2 2/4] arm64: dts: qcom: x1e78100-t14s: add hpd gpio to
 LCD panel

The eDP panel has an HPD GPIO. Describe it in the devicetree.

Unfortunately I cannot test this on the non-OLED model since I
only have access to the model with OLED (which also uses the
HPD GPIO).

I believe this could be split into two patches; one adding the
pinctrl node and one adding the hpd gpio to the T14s devicetree.
But I will wait for your comments on this ;-).

Signed-off-by: Christopher Obbard <christopher.obbard@...aro.org>
---
 arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi | 11 +++++++++++
 1 file changed, 11 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 962fb050c55c4fd33f480a21a8c47a484d0c82b8..46c73f5c039ed982b553636cf8c4237a20ba7687 100644
--- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
@@ -980,8 +980,12 @@ &mdss_dp3 {
 	aux-bus {
 		panel: panel {
 			compatible = "edp-panel";
+			hpd-gpios = <&tlmm 119 GPIO_ACTIVE_HIGH>;
 			power-supply = <&vreg_edp_3p3>;
 
+			pinctrl-0 = <&edp_hpd_n_default>;
+			pinctrl-names = "default";
+
 			port {
 				edp_panel_in: endpoint {
 					remote-endpoint = <&mdss_dp3_out>;
@@ -1286,6 +1290,13 @@ hall_int_n_default: hall-int-n-state {
 		bias-disable;
 	};
 
+	edp_hpd_n_default: edp-hpd-n-state {
+		pins = "gpio119";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-pull-up;
+	};
+
 	pcie4_default: pcie4-default-state {
 		clkreq-n-pins {
 			pins = "gpio147";

-- 
2.49.0