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usr / src / sys / contrib / device-tree / Bindings / leds / backlight /

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📄 88pm860x.txt(306 B)
📄 arcxcnn_bl.txt(1.01 KB)
📄 gpio-backlight.txt(395 B)
📄 gpio-backlight.yaml(839 B)
📄 led-backlight.txt(882 B)
📄 led-backlight.yaml(1.5 KB)
📄 lm3630a-backlight.yaml(3.47 KB)
📄 lp855x.txt(1.65 KB)
📄 max8925-backlight.txt(173 B)
📄 pwm-backlight.txt(2.36 KB)
📄 pwm-backlight.yaml(2.76 KB)
📄 qcom-wled.yaml(5.87 KB)
📄 sky81452-backlight.txt(922 B)
📄 tps65217-backlight.txt(771 B)
📄 zii,rave-sp-backlight.txt(608 B)

Editing: lp855x.txt

lp855x bindings

Required properties:
  - compatible: "ti,lp8550", "ti,lp8551", "ti,lp8552", "ti,lp8553",
                "ti,lp8555", "ti,lp8556", "ti,lp8557"
  - reg: I2C slave address (u8)
  - dev-ctrl: Value of DEVICE CONTROL register (u8). It depends on the device.

Optional properties:
  - bl-name: Backlight device name (string)
  - init-brt: Initial value of backlight brightness (u8)
  - pwm-period: PWM period value. Set only PWM input mode used (u32)
  - rom-addr: Register address of ROM area to be updated (u8)
  - rom-val: Register value to be updated (u8)
  - power-supply: Regulator which controls the 3V rail
  - enable-supply: Regulator which controls the EN/VDDIO input

Example:

/* LP8555 */
	backlight@2c {
		compatible = "ti,lp8555";
		reg = <0x2c>;

dev-ctrl = /bits/ 8 <0x00>;
		pwm-period = <10000>;

/* 4V OV, 4 output LED0 string enabled */
		rom_14h {
			rom-addr = /bits/ 8 <0x14>;
			rom-val = /bits/ 8 <0xcf>;
		};

/* Heavy smoothing, 24ms ramp time step */
		rom_15h {
			rom-addr = /bits/ 8 <0x15>;
			rom-val = /bits/ 8 <0xc7>;
		};

/* 4 output LED1 string enabled */
		rom_19h {
			rom-addr = /bits/ 8 <0x19>;
			rom-val = /bits/ 8 <0x0f>;
		};
	};

/* LP8556 */
	backlight@2c {
		compatible = "ti,lp8556";
		reg = <0x2c>;

bl-name = "lcd-bl";
		dev-ctrl = /bits/ 8 <0x85>;
		init-brt = /bits/ 8 <0x10>;
	};

/* LP8557 */
	backlight@2c {
		compatible = "ti,lp8557";
		reg = <0x2c>;
		enable-supply = <&backlight_vddio>;
		power-supply = <&backlight_vdd>;

dev-ctrl = /bits/ 8 <0x41>;
		init-brt = /bits/ 8 <0x0a>;

/* 4V OV, 4 output LED string enabled */
		rom_14h {
			rom-addr = /bits/ 8 <0x14>;
			rom-val = /bits/ 8 <0xcf>;
		};
	};

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Editing: lp855x.txt

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