1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun%YAML 1.2 3*4882a593Smuzhiyun--- 4*4882a593Smuzhiyun$id: http://devicetree.org/schemas/leds/backlight/led-backlight.yaml# 5*4882a593Smuzhiyun$schema: http://devicetree.org/meta-schemas/core.yaml# 6*4882a593Smuzhiyun 7*4882a593Smuzhiyuntitle: led-backlight bindings 8*4882a593Smuzhiyun 9*4882a593Smuzhiyunmaintainers: 10*4882a593Smuzhiyun - Lee Jones <lee.jones@linaro.org> 11*4882a593Smuzhiyun - Daniel Thompson <daniel.thompson@linaro.org> 12*4882a593Smuzhiyun - Jingoo Han <jingoohan1@gmail.com> 13*4882a593Smuzhiyun 14*4882a593Smuzhiyundescription: 15*4882a593Smuzhiyun This binding is used to describe a basic backlight device made of LEDs. It 16*4882a593Smuzhiyun can also be used to describe a backlight device controlled by the output of 17*4882a593Smuzhiyun a LED driver. 18*4882a593Smuzhiyun 19*4882a593Smuzhiyunproperties: 20*4882a593Smuzhiyun compatible: 21*4882a593Smuzhiyun const: led-backlight 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun leds: 24*4882a593Smuzhiyun description: A list of LED nodes 25*4882a593Smuzhiyun $ref: /schemas/types.yaml#/definitions/phandle-array 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun brightness-levels: 28*4882a593Smuzhiyun description: 29*4882a593Smuzhiyun Array of distinct brightness levels. The levels must be in the range 30*4882a593Smuzhiyun accepted by the underlying LED devices. This is used to translate a 31*4882a593Smuzhiyun backlight brightness level into a LED brightness level. If it is not 32*4882a593Smuzhiyun provided, the identity mapping is used. 33*4882a593Smuzhiyun $ref: /schemas/types.yaml#/definitions/uint32-array 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun default-brightness-level: 36*4882a593Smuzhiyun description: 37*4882a593Smuzhiyun The default brightness level (index into the array defined by the 38*4882a593Smuzhiyun "brightness-levels" property). 39*4882a593Smuzhiyun $ref: /schemas/types.yaml#/definitions/uint32 40*4882a593Smuzhiyun 41*4882a593Smuzhiyunrequired: 42*4882a593Smuzhiyun - compatible 43*4882a593Smuzhiyun - leds 44*4882a593Smuzhiyun 45*4882a593SmuzhiyunadditionalProperties: false 46*4882a593Smuzhiyun 47*4882a593Smuzhiyunexamples: 48*4882a593Smuzhiyun - | 49*4882a593Smuzhiyun backlight { 50*4882a593Smuzhiyun compatible = "led-backlight"; 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun leds = <&led1>, <&led2>; 53*4882a593Smuzhiyun brightness-levels = <0 4 8 16 32 64 128 255>; 54*4882a593Smuzhiyun default-brightness-level = <6>; 55*4882a593Smuzhiyun }; 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun... 58