linux-kernel - [PATCH v3 1/2] arm64: dts: qcom: x1e78100-t14s: add hpd gpio to eDP panel

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Message-Id: <20250327-wip-obbardc-qcom-t14s-oled-panel-v3-1-45d5f2747398@linaro.org>
Date: Thu, 27 Mar 2025 16:56:53 +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>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: [PATCH v3 1/2] arm64: dts: qcom: x1e78100-t14s: add hpd gpio to
 eDP panel

The eDP panel has an HPD GPIO. Describe it in the device tree
for the generic T14s model, as the HPD GPIO property is used in
both the OLED and LCD models which inherit this device tree.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
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