From e53655dac60665ffc736914f336493c5f45977a0 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 18:18:37 +0200
Subject: [PATCH] arm64: dts: qcom: sc8280xp-arcata: Enable backlight
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Add backlight nodes and enable backlight so that it can be controlled
with the corresponding buttons found on Surface Pro Type Cover keyboards.

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-v3-1-6aa6f6612c10@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
---
 .../dts/qcom/sc8280xp-microsoft-arcata.dts    | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts b/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts
index 3d589f05b90e..a3951ee74a85 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts
+++ b/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-arcata.dts
@@ -46,6 +46,15 @@
 		#sound-dai-cells = <1>;
 	};
 
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pmc8280c_lpg 3 1000000>;
+		enable-gpios = <&pmc8280_1_gpios 8 GPIO_ACTIVE_HIGH>;
+
+		pinctrl-0 = <&edp_bl_en>, <&edp_bl_pwm>;
+		pinctrl-names = "default";
+	};
+
 	pmic-glink {
 		compatible = "qcom,sc8280xp-pmic-glink", "qcom,pmic-glink";
 
@@ -557,6 +566,10 @@
 	status = "okay";
 };
 
+&pmc8280c_lpg {
+	status = "okay";
+};
+
 &pmk8280_pon_pwrkey {
 	status = "okay";
 };
@@ -857,6 +870,13 @@
 	status = "okay";
 };
 
+&pmc8280_1_gpios {
+	edp_bl_en: edp-bl-en-state {
+		pins = "gpio8";
+		function = "normal";
+	};
+};
+
 &pmc8280_2_gpios {
 	wwan_sw_en: wwan-sw-en-state {
 		pins = "gpio1";
@@ -864,6 +884,13 @@
 	};
 };
 
+&pmc8280c_gpios {
+	edp_bl_pwm: edp-bl-pwm-state {
+		pins = "gpio8";
+		function = "func1";
+	};
+};
+
 &pmr735a_gpios {
 	hastings_reg_en: hastings-reg-en-state {
 		pins = "gpio1";