Documentation/devicetree/bindings/video/backlight/lp855x.txt

   1 lp855x bindings
   2
   3 Required properties:
   4   - compatible: "ti,lp8550", "ti,lp8551", "ti,lp8552", "ti,lp8553",
   5                 "ti,lp8555", "ti,lp8556", "ti,lp8557"
   6   - reg: I2C slave address (u8)
   7   - dev-ctrl: Value of DEVICE CONTROL register (u8). It depends on the device.
   8
   9 Optional properties:
  10   - bl-name: Backlight device name (string)
  11   - init-brt: Initial value of backlight brightness (u8)
  12   - pwm-period: PWM period value. Set only PWM input mode used (u32)
  13   - rom-addr: Register address of ROM area to be updated (u8)
  14   - rom-val: Register value to be updated (u8)
  15   - power-supply: Regulator which controls the 3V rail
  16
  17 Example:
  18
  19         /* LP8555 */
  20         backlight@2c {
  21                 compatible = "ti,lp8555";
  22                 reg = <0x2c>;
  23
  24                 dev-ctrl = /bits/ 8 <0x00>;
  25                 pwm-period = <10000>;
  26
  27                 /* 4V OV, 4 output LED0 string enabled */
  28                 rom_14h {
  29                         rom-addr = /bits/ 8 <0x14>;
  30                         rom-val = /bits/ 8 <0xcf>;
  31                 };
  32
  33                 /* Heavy smoothing, 24ms ramp time step */
  34                 rom_15h {
  35                         rom-addr = /bits/ 8 <0x15>;
  36                         rom-val = /bits/ 8 <0xc7>;
  37                 };
  38
  39                 /* 4 output LED1 string enabled */
  40                 rom_19h {
  41                         rom-addr = /bits/ 8 <0x19>;
  42                         rom-val = /bits/ 8 <0x0f>;
  43                 };
  44         };
  45
  46         /* LP8556 */
  47         backlight@2c {
  48                 compatible = "ti,lp8556";
  49                 reg = <0x2c>;
  50
  51                 bl-name = "lcd-bl";
  52                 dev-ctrl = /bits/ 8 <0x85>;
  53                 init-brt = /bits/ 8 <0x10>;
  54         };
  55
  56         /* LP8557 */
  57         backlight@2c {
  58                 compatible = "ti,lp8557";
  59                 reg = <0x2c>;
  60                 power-supply = <&backlight_vdd>;
  61
  62                 dev-ctrl = /bits/ 8 <0x41>;
  63                 init-brt = /bits/ 8 <0x0a>;
  64
  65                 /* 4V OV, 4 output LED string enabled */
  66                 rom_14h {
  67                         rom-addr = /bits/ 8 <0x14>;
  68                         rom-val = /bits/ 8 <0xcf>;
  69                 };
  70         };