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 7title: led-backlight bindings 8 9maintainers: 10 - Lee Jones <lee.jones@linaro.org> 11 - Daniel Thompson <daniel.thompson@linaro.org> 12 - Jingoo Han <jingoohan1@gmail.com> 13 14description: 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 19properties: 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 43required: 44 - compatible 45 - leds 46 47additionalProperties: false 48 49examples: 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... 60