Kernel-4.18.0-80.el8_lp855x

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>;
    };
};