From 587ea6a79584b5323e5eb3e2435c858177cca49c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20de=20Bretagne?=
 <jerome.debretagne@gmail.com>
Date: Thu, 4 Jun 2026 18:18:38 +0200
Subject: [PATCH] arm64: dts: qcom: sc8280xp-arcata: Enable the eDP display
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Add the vreg_edp_3p3, edp_reg_en and mdss0_dp3 nodes to enable the
Surface Pro 9 5G eDP-based LCD display (LG LP129WT232166).

Signed-off-by: Jérôme de Bretagne <jerome.debretagne@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260604-surface-sp9-5g-for-next-v3-2-6aa6f6612c10@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
---
 .../dts/qcom/sc8280xp-microsoft-arcata.dts    | 64 +++++++++++++++++--
 1 file changed, 59 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts b/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts
index a3951ee74a85..49cd55a2653f 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts
+++ b/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts
@@ -136,6 +136,22 @@
 		};
 	};
 
+	vreg_edp_3p3: regulator-edp-3p3 {
+		compatible = "regulator-fixed";
+
+		regulator-name = "VREG_EDP_3P3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		gpio = <&tlmm 36 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		pinctrl-0 = <&edp_reg_en>;
+		pinctrl-names = "default";
+
+		regulator-boot-on;
+	};
+
 	vreg_nvme: regulator-nvme {
 		compatible = "regulator-fixed";
 
@@ -344,7 +360,6 @@
 			regulator-max-microvolt = <880000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 			regulator-boot-on;
-			regulator-always-on;	// FIXME: VDD_A_EDP_0_0P9
 		};
 	};
 
@@ -448,10 +463,6 @@
 	status = "okay";
 };
 
-&dispcc1 {
-	status = "okay";
-};
-
 &gpi_dma0 {
 	status = "okay";
 };
@@ -494,6 +505,42 @@
 	remote-endpoint = <&usb_1_qmpphy_dp_in>;
 };
 
+&mdss0_dp3 {
+	compatible = "qcom,sc8280xp-edp";
+	/delete-property/ #sound-dai-cells;
+
+	data-lanes = <0 1 2 3>;
+
+	status = "okay";
+
+	aux-bus {
+		panel {
+			compatible = "edp-panel";
+
+			backlight = <&backlight>;
+			power-supply = <&vreg_edp_3p3>;
+
+			port {
+				edp_panel_in: endpoint {
+					remote-endpoint = <&mdss0_dp3_out>;
+				};
+			};
+		};
+	};
+};
+
+&mdss0_dp3_out {
+	remote-endpoint = <&edp_panel_in>;
+};
+
+&mdss0_dp3_phy {
+	compatible = "qcom,sc8280xp-edp-phy";
+	vdda-phy-supply = <&vreg_l6b>;
+	vdda-pll-supply = <&vreg_l3b>;
+
+	status = "okay";
+};
+
 &pcie2a {
 	vddpe-3v3-supply = <&vreg_nvme>;
 
@@ -914,6 +961,13 @@
 		};
 	};
 
+	edp_reg_en: edp-reg-en-state {
+		pins = "gpio36";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-disable;
+	};
+
 	nvme_reg_en: nvme-reg-en-state {
 		pins = "gpio135";
 		function = "gpio";