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