linux-kernel - [PATCH 2/2] arm64: dts: qcom: msm8917-xiaomi-riva: Add display backlight

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Message-Id: <20250212-pm8937-pwm-v1-2-a900a779b4ad@mainlining.org>
Date: Wed, 12 Feb 2025 23:21:51 +0100
From: Barnabás Czémán <barnabas.czeman@...nlining.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Barnabás Czémán <barnabas.czeman@...nlining.org>
Subject: [PATCH 2/2] arm64: dts: qcom: msm8917-xiaomi-riva: Add display
 backlight

Redmi 5A display uses pwm backlight, add support for it.

Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
---
 arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts | 25 ++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts b/arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts
index f1d22535fedd94467ba3f0a88b2110ce5360e7e1..8808306c989f54116052667887f9bf36b63c4c64 100644
--- a/arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts
+++ b/arch/arm64/boot/dts/qcom/msm8917-xiaomi-riva.dts
@@ -20,6 +20,14 @@ / {
 	qcom,msm-id = <QCOM_ID_MSM8917 0>;
 	qcom,board-id = <0x1000b 2>, <0x2000b 2>;
 
+	pwm_backlight: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pm8937_pwm 0 100000>;
+		brightness-levels = <0 255>;
+		num-interpolated-steps = <255>;
+		default-brightness-level = <128>;
+	};
+
 	battery: battery {
 		compatible = "simple-battery";
 		charge-full-design-microamp-hours = <3000000>;
@@ -131,6 +139,23 @@ bq25601@6b{
 	};
 };
 
+&pm8937_gpios {
+	pwm_enable_default: pwm-enable-default-state {
+		pins = "gpio8";
+		function = "dtest2";
+		output-low;
+		bias-disable;
+		qcom,drive-strength = <2>;
+	};
+};
+
+&pm8937_pwm {
+	pinctrl-0 = <&pwm_enable_default>;
+	pinctrl-names = "default";
+
+	status = "okay";
+};
+
 &pm8937_resin {
 	linux,code = <KEY_VOLUMEDOWN>;
 

-- 
2.48.1