tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1lp855x bindings
2
3Required 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
9Optional 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
16Example:
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 };