linux-kernel - [PATCH v6 1/2] arm64: dts: qcom: x1e78100-t14s: add hpd gpio to dp controller

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Message-Id: <20250731-wip-obbardc-qcom-t14s-oled-panel-v6-1-4782074104d1@linaro.org>
Date: Thu, 31 Jul 2025 21:51:26 +0100
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 v6 1/2] arm64: dts: qcom: x1e78100-t14s: add hpd gpio to dp
 controller

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

Signed-off-by: Christopher Obbard <christopher.obbard@...aro.org>
---
 arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi | 3 +++
 arch/arm64/boot/dts/qcom/x1e80100.dtsi                      | 5 +++++
 2 files changed, 8 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 ac1dddf27da30e6a9f7e1d1ecbd5192bf2d0671e..c33dce6fec6746cc7fe2f7a1ab5e9f99feea5535 100644
--- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
@@ -1008,6 +1008,9 @@ &mdss_dp1_out {
 &mdss_dp3 {
 	/delete-property/ #sound-dai-cells;
 
+	pinctrl-names = "default";
+	pinctrl-0 = <&edp_hpd_active>;
+
 	status = "okay";
 
 	aux-bus {
diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
index 5e9a8fa3cf96468b12775f91192cbd779d5ce946..8efd045af778beb30831f3af5ad2b901a72d87d7 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
@@ -5779,6 +5779,11 @@ tlmm: pinctrl@...0000 {
 			gpio-ranges = <&tlmm 0 0 239>;
 			wakeup-parent = <&pdc>;
 
+			edp_hpd_active: edp-hpd-active-state {
+				pins = "gpio119";
+				function = "edp0_hot";
+			};
+
 			qup_i2c0_data_clk: qup-i2c0-data-clk-state {
 				/* SDA, SCL */
 				pins = "gpio0", "gpio1";

-- 
2.50.1