1 # SPDX-License-Identifier: GPL-2.0-only
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/led-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: led-backlight bindings
8
9 maintainers:
10 - Lee Jones <lee@kernel.org>
11 - Daniel Thompson <daniel.thompson@linaro.org>
12 - Jingoo Han <jingoohan1@gmail.com>
13
14 description:
15 This binding is used to describe a basic backlight device made of LEDs. It
16 can also be used to describe a backlight device controlled by the output of
17 a LED driver.
18
19 properties:
20 compatible:
21 const: led-backlight
22
23 leds:
24 description: A list of LED nodes
25 $ref: /schemas/types.yaml#/definitions/phandle-array
26 items:
27 maxItems: 1
28
29 brightness-levels:
30 description:
31 Array of distinct brightness levels. The levels must be in the range
32 accepted by the underlying LED devices. This is used to translate a
33 backlight brightness level into a LED brightness level. If it is not
34 provided, the identity mapping is used.
35 $ref: /schemas/types.yaml#/definitions/uint32-array
36
37 default-brightness-level:
38 description:
39 The default brightness level (index into the array defined by the
40 "brightness-levels" property).
41 $ref: /schemas/types.yaml#/definitions/uint32
42
43 required:
44 - compatible
45 - leds
46
47 additionalProperties: false
48
49 examples:
50 - |
51 backlight {
52 compatible = "led-backlight";
53
54 leds = <&led1>, <&led2>;
55 brightness-levels = <0 4 8 16 32 64 128 255>;
56 default-brightness-level = <6>;
57 };
58
59 ...
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