summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/leds/backlight/lp855x-backlight.yaml
blob: 9416e1bfab92c10cfe48ae65fbd5fab95e3548c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/lp855x-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Texas Instruments LP855X backlight controllers

maintainers:
  - Artur Weber <aweber.kernel@gmail.com>

properties:
  compatible:
    enum:
      - ti,lp8550
      - ti,lp8551
      - ti,lp8552
      - ti,lp8553
      - ti,lp8555
      - ti,lp8556
      - ti,lp8557

  reg:
    maxItems: 1

  dev-ctrl:
    $ref: /schemas/types.yaml#/definitions/uint8
    description:
      Value of device control register. This is a device-specific value.

  bl-name:
    $ref: /schemas/types.yaml#/definitions/string
    description: Backlight device name.

  init-brt:
    $ref: /schemas/types.yaml#/definitions/uint8
    description: Initial value of backlight brightness.

  power-supply:
    description: Regulator which controls the 3V rail.

  enable-supply:
    description: Regulator which controls the EN/VDDIO input.

  pwms:
    maxItems: 1
    description: |
      PWM channel to use for controlling the backlight; setting this
      enables the PWM-based backlight control mode.

  pwm-names: true

  pwm-period:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      PWM period value. Deprecated; set the period value in the pwms
      property instead.
    deprecated: true

patternProperties:
  "^rom-[0-9a-f]{2}h$":
    type: object
    description: Nodes containing the values of configuration registers.
    additionalProperties: false
    properties:
      rom-addr:
        $ref: /schemas/types.yaml#/definitions/uint8
        description: Register address of ROM area to be updated.

      rom-val:
        $ref: /schemas/types.yaml#/definitions/uint8
        description: Value to write to the ROM register.

required:
  - compatible
  - reg
  - dev-ctrl

unevaluatedProperties: false

examples:
  - |
    i2c {
        #address-cells = <1>;
        #size-cells = <0>;

        backlight@2c {
            compatible = "ti,lp8555";
            reg = <0x2c>;

            dev-ctrl = /bits/ 8 <0x00>;

            pwms = <&pwm 0 10000>;
            pwm-names = "lp8555";

            /* 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>;
            };
        };
    };
  - |
    i2c {
        #address-cells = <1>;
        #size-cells = <0>;

        backlight@2c {
            compatible = "ti,lp8556";
            reg = <0x2c>;

            bl-name = "lcd-bl";
            dev-ctrl = /bits/ 8 <0x85>;
            init-brt = /bits/ 8 <0x10>;
        };
      };
  - |
    i2c {
        #address-cells = <1>;
        #size-cells = <0>;

        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>;
            };
        };
    };