1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/lp855x-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Texas Instruments LP855X backlight controllers
8
9 maintainers:
10 - Artur Weber <aweber.kernel@gmail.com>
11
12 properties:
13 compatible:
14 enum:
15 - ti,lp8550
16 - ti,lp8551
17 - ti,lp8552
18 - ti,lp8553
19 - ti,lp8555
20 - ti,lp8556
21 - ti,lp8557
22
23 reg:
24 maxItems: 1
25
26 dev-ctrl:
27 $ref: /schemas/types.yaml#/definitions/uint8
28 description:
29 Value of device control register. This is a device-specific value.
30
31 bl-name:
32 $ref: /schemas/types.yaml#/definitions/string
33 description: Backlight device name.
34
35 init-brt:
36 $ref: /schemas/types.yaml#/definitions/uint8
37 description: Initial value of backlight brightness.
38
39 power-supply:
40 description: Regulator which controls the 3V rail.
41
42 enable-supply:
43 description: Regulator which controls the EN/VDDIO input.
44
45 pwms:
46 maxItems: 1
47 description: |
48 PWM channel to use for controlling the backlight; setting this
49 enables the PWM-based backlight control mode.
50
51 pwm-names: true
52
53 pwm-period:
54 $ref: /schemas/types.yaml#/definitions/uint32
55 description:
56 PWM period value. Deprecated; set the period value in the pwms
57 property instead.
58 deprecated: true
59
60 patternProperties:
61 "^rom-[0-9a-f]{2}h$":
62 type: object
63 description: Nodes containing the values of configuration registers.
64 additionalProperties: false
65 properties:
66 rom-addr:
67 $ref: /schemas/types.yaml#/definitions/uint8
68 description: Register address of ROM area to be updated.
69
70 rom-val:
71 $ref: /schemas/types.yaml#/definitions/uint8
72 description: Value to write to the ROM register.
73
74 required:
75 - compatible
76 - reg
77 - dev-ctrl
78
79 unevaluatedProperties: false
80
81 examples:
82 - |
83 i2c {
84 #address-cells = <1>;
85 #size-cells = <0>;
86
87 backlight@2c {
88 compatible = "ti,lp8555";
89 reg = <0x2c>;
90
91 dev-ctrl = /bits/ 8 <0x00>;
92
93 pwms = <&pwm 0 10000>;
94 pwm-names = "lp8555";
95
96 /* 4V OV, 4 output LED0 string enabled */
97 rom-14h {
98 rom-addr = /bits/ 8 <0x14>;
99 rom-val = /bits/ 8 <0xcf>;
100 };
101
102 /* Heavy smoothing, 24ms ramp time step */
103 rom-15h {
104 rom-addr = /bits/ 8 <0x15>;
105 rom-val = /bits/ 8 <0xc7>;
106 };
107
108 /* 4 output LED1 string enabled */
109 rom-19h {
110 rom-addr = /bits/ 8 <0x19>;
111 rom-val = /bits/ 8 <0x0f>;
112 };
113 };
114 };
115 - |
116 i2c {
117 #address-cells = <1>;
118 #size-cells = <0>;
119
120 backlight@2c {
121 compatible = "ti,lp8556";
122 reg = <0x2c>;
123
124 bl-name = "lcd-bl";
125 dev-ctrl = /bits/ 8 <0x85>;
126 init-brt = /bits/ 8 <0x10>;
127 };
128 };
129 - |
130 i2c {
131 #address-cells = <1>;
132 #size-cells = <0>;
133
134 backlight@2c {
135 compatible = "ti,lp8557";
136 reg = <0x2c>;
137 enable-supply = <&backlight_vddio>;
138 power-supply = <&backlight_vdd>;
139
140 dev-ctrl = /bits/ 8 <0x41>;
141 init-brt = /bits/ 8 <0x0a>;
142
143 /* 4V OV, 4 output LED string enabled */
144 rom-14h {
145 rom-addr = /bits/ 8 <0x14>;
146 rom-val = /bits/ 8 <0xcf>;
147 };
148 };
149 };
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