From ea65d256e14d27c1da6dbd1393fc3ba17c29f929 Mon Sep 17 00:00:00 2001
From: =?utf8?q?N=C3=ADcolas=20F=2E=20R=2E=20A=2E=20Prado?=
 <nfraprado@collabora.com>
Date: Wed, 2 Nov 2022 15:06:08 -0400
Subject: [PATCH] arm64: dts: mediatek: asurada: Add display backlight
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Add the display backlight for the Asurada platform. It relies on the
display PWM controller, so also enable and configure this component.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20221102190611.283546-3-nfraprado@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
---
 arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi | 28 ++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
index fafca74..666021c 100644
--- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
@@ -23,6 +23,16 @@
 		reg = <0 0x40000000 0 0x80000000>;
 	};
 
+	backlight_lcd0: backlight-lcd0 {
+		compatible = "pwm-backlight";
+		pwms = <&pwm0 0 500000>;
+		power-supply = <&ppvar_sys>;
+		enable-gpios = <&pio 152 0>;
+		brightness-levels = <0 1023>;
+		num-interpolated-steps = <1023>;
+		default-brightness-level = <576>;
+	};
+
 	pp1000_dpbrdg: regulator-1v0-dpbrdg {
 		compatible = "regulator-fixed";
 		regulator-name = "pp1000_dpbrdg";
@@ -838,6 +848,17 @@
 		};
 	};
 
+	pwm0_pins: pwm0-default-pins {
+		pins-pwm {
+			pinmux = <PINMUX_GPIO40__FUNC_DISP_PWM>;
+		};
+
+		pins-inhibit {
+			pinmux = <PINMUX_GPIO152__FUNC_GPIO152>;
+			output-high;
+		};
+	};
+
 	scp_pins: scp-pins {
 		pins-vreq-vao {
 			pinmux = <PINMUX_GPIO195__FUNC_SCP_VREQ_VAO>;
@@ -899,6 +920,13 @@
 	interrupts-extended = <&pio 214 IRQ_TYPE_LEVEL_HIGH>;
 };
 
+&pwm0 {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm0_pins>;
+};
+
 &scp {
 	status = "okay";
 
-- 
2.7.4