Documentation/devicetree/bindings/leds/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   - enable-supply: Regulator which controls the EN/VDDIO input
  17
  18 Example:
  19
  20         /* LP8555 */
  21         backlight@2c {
  22                 compatible = "ti,lp8555";
  23                 reg = <0x2c>;
  24
  25                 dev-ctrl = /bits/ 8 <0x00>;
  26                 pwm-period = <10000>;
  27
  28                 /* 4V OV, 4 output LED0 string enabled */
  29                 rom_14h {
  30                         rom-addr = /bits/ 8 <0x14>;
  31                         rom-val = /bits/ 8 <0xcf>;
  32                 };
  33
  34                 /* Heavy smoothing, 24ms ramp time step */
  35                 rom_15h {
  36                         rom-addr = /bits/ 8 <0x15>;
  37                         rom-val = /bits/ 8 <0xc7>;
  38                 };
  39
  40                 /* 4 output LED1 string enabled */
  41                 rom_19h {
  42                         rom-addr = /bits/ 8 <0x19>;
  43                         rom-val = /bits/ 8 <0x0f>;
  44                 };
  45         };
  46
  47         /* LP8556 */
  48         backlight@2c {
  49                 compatible = "ti,lp8556";
  50                 reg = <0x2c>;
  51
  52                 bl-name = "lcd-bl";
  53                 dev-ctrl = /bits/ 8 <0x85>;
  54                 init-brt = /bits/ 8 <0x10>;
  55         };
  56
  57         /* LP8557 */
  58         backlight@2c {
  59                 compatible = "ti,lp8557";
  60                 reg = <0x2c>;
  61                 enable-supply = <&backlight_vddio>;
  62                 power-supply = <&backlight_vdd>;
  63
  64                 dev-ctrl = /bits/ 8 <0x41>;
  65                 init-brt = /bits/ 8 <0x0a>;
  66
  67                 /* 4V OV, 4 output LED string enabled */
  68                 rom_14h {
  69                         rom-addr = /bits/ 8 <0x14>;
  70                         rom-val = /bits/ 8 <0xcf>;
  71                 };
  72         };