linux-kernel - [PATCH 3/3] ARM: dts: qcom: apq8026-samsung-matisse-wifi: Add display backlight

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Date:   Fri,  6 Jan 2023 13:44:03 +0200
From:   Matti Lehtimäki <matti.lehtimaki@...il.com>
To:     linux-arm-msm@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Matti Lehtimäki <matti.lehtimaki@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] ARM: dts: qcom: apq8026-samsung-matisse-wifi: Add display backlight

Uses ti,lp8556 backlight with clk-pwm.

Signed-off-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
---
 .../dts/qcom-apq8026-samsung-matisse-wifi.dts | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts b/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts
index 15b9590ba07b..848cfda64e5a 100644
--- a/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts
+++ b/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts
@@ -23,6 +23,14 @@ aliases {
 		display0 = &framebuffer0;
 	};
 
+	backlight_pwm: pwm {
+		compatible = "clk-pwm";
+		#pwm-cells = <2>;
+		clocks = <&mmcc CAMSS_GP0_CLK>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&backlight_pwm_default_state>;
+	};
+
 	chosen {
 		#address-cells = <1>;
 		#size-cells = <1>;
@@ -80,6 +88,45 @@ key-volume-up {
 		};
 	};
 
+	i2c-backlight {
+		compatible = "i2c-gpio";
+		sda-gpios = <&tlmm 20 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&tlmm 21 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&backlight_i2c_default_state>;
+
+		i2c-gpio,delay-us = <4>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		backlight@2c {
+			compatible = "ti,lp8556";
+			reg = <0x2c>;
+
+			dev-ctrl = /bits/ 8 <0x80>;
+			init-brt = /bits/ 8 <0x3f>;
+			pwm-period = <100000>;
+
+			pwms = <&backlight_pwm 0 100000>;
+			pwm-names = "lp8556";
+
+			rom-a0h {
+				rom-addr = /bits/ 8 <0xa0>;
+				rom-val = /bits/ 8 <0x44>;
+			};
+			rom-a1h {
+				rom-addr = /bits/ 8 <0xa1>;
+				rom-val = /bits/ 8 <0x6c>;
+			};
+			rom-a5h {
+				rom-addr = /bits/ 8 <0xa5>;
+				rom-val = /bits/ 8 <0x24>;
+			};
+		};
+	};
+
 	reg_tsp_1p8v: regulator-tsp-1p8v {
 		compatible = "regulator-fixed";
 		regulator-name = "tsp_1p8v";
@@ -418,6 +465,18 @@ accel_int_default_state: accel-int-default-state {
 		bias-disable;
 	};
 
+	backlight_i2c_default_state: backlight-i2c-default-state {
+		pins = "gpio20", "gpio21";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	backlight_pwm_default_state: backlight-pwm-default-state {
+		pins = "gpio33";
+		function = "gp0_clk";
+	};
+
 	muic_int_default_state: muic-int-default-state {
 		pins = "gpio67";
 		function = "gpio";
-- 
2.34.1