1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/ti,lm3509.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: TI LM3509 High Efficiency Boost for White LED's and/or OLED Displays
8
9 maintainers:
10 - Patrick Gansterer <paroga@paroga.com>
11
12 description:
13 The LM3509 current mode boost converter offers two separate outputs.
14 https://www.ti.com/product/LM3509
15
16 properties:
17 compatible:
18 const: ti,lm3509
19
20 reg:
21 maxItems: 1
22
23 "#address-cells":
24 const: 1
25
26 "#size-cells":
27 const: 0
28
29 reset-gpios:
30 maxItems: 1
31
32 ti,brightness-rate-of-change-us:
33 description: Brightness Rate of Change in microseconds.
34 enum: [51, 13000, 26000, 52000]
35
36 ti,oled-mode:
37 description: Enable OLED mode.
38 type: boolean
39
40 patternProperties:
41 "^led@[01]$":
42 type: object
43 description: Properties for a string of connected LEDs.
44 $ref: common.yaml#
45
46 properties:
47 reg:
48 description:
49 The control register that is used to program the two current sinks.
50 The LM3509 has two registers (BMAIN and BSUB) and are represented
51 as 0 or 1 in this property. The two current sinks can be controlled
52 independently with both registers, or register BMAIN can be
53 configured to control both sinks with the led-sources property.
54 minimum: 0
55 maximum: 1
56
57 label: true
58
59 led-sources:
60 minItems: 1
61 maxItems: 2
62 items:
63 minimum: 0
64 maximum: 1
65
66 default-brightness:
67 minimum: 0
68 maximum: 31
69 default: 18
70
71 max-brightness:
72 minimum: 0
73 maximum: 31
74 default: 31
75
76 required:
77 - reg
78
79 additionalProperties: false
80
81 required:
82 - compatible
83 - reg
84
85 additionalProperties: false
86
87 examples:
88 - |
89 #include <dt-bindings/gpio/gpio.h>
90 i2c {
91 #address-cells = <1>;
92 #size-cells = <0>;
93
94 backlight@36 {
95 compatible = "ti,lm3509";
96 reg = <0x36>;
97 reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
98
99 ti,oled-mode;
100 ti,brightness-rate-of-change-us = <52000>;
101
102 #address-cells = <1>;
103 #size-cells = <0>;
104
105 led@0 {
106 reg = <0>;
107 led-sources = <0 1>;
108 label = "lcd-backlight";
109 default-brightness = <12>;
110 max-brightness = <31>;
111 };
112 };
113 };
114 - |
115 i2c {
116 #address-cells = <1>;
117 #size-cells = <0>;
118
119 backlight@36 {
120 compatible = "ti,lm3509";
121 reg = <0x36>;
122
123 #address-cells = <1>;
124 #size-cells = <0>;
125
126 led@0 {
127 reg = <0>;
128 default-brightness = <12>;
129 };
130
131 led@1 {
132 reg = <1>;
133 default-brightness = <15>;
134 };
135 };
136 };
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