1*4882a593Smuzhiyun# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2*4882a593Smuzhiyun%YAML 1.2 3*4882a593Smuzhiyun--- 4*4882a593Smuzhiyun$id: http://devicetree.org/schemas/leds/backlight/common.yaml# 5*4882a593Smuzhiyun$schema: http://devicetree.org/meta-schemas/core.yaml# 6*4882a593Smuzhiyun 7*4882a593Smuzhiyuntitle: Common backlight properties 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 Backlight devices provide backlight for different types of graphical 16*4882a593Smuzhiyun displays. They are typically but not necessarily implemented using a white 17*4882a593Smuzhiyun LED powered by a boost converter. 18*4882a593Smuzhiyun 19*4882a593Smuzhiyunproperties: 20*4882a593Smuzhiyun default-brightness: 21*4882a593Smuzhiyun description: 22*4882a593Smuzhiyun The default brightness that should be applied to the LED by the operating 23*4882a593Smuzhiyun system on start-up. The brightness should not exceed the brightness the 24*4882a593Smuzhiyun LED can provide. 25*4882a593Smuzhiyun $ref: /schemas/types.yaml#definitions/uint32 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun max-brightness: 28*4882a593Smuzhiyun description: 29*4882a593Smuzhiyun Normally the maximum brightness is determined by the hardware and this 30*4882a593Smuzhiyun property is not required. This property is used to put a software limit 31*4882a593Smuzhiyun on the brightness apart from what the driver says, as it could happen 32*4882a593Smuzhiyun that a LED can be made so bright that it gets damaged or causes damage 33*4882a593Smuzhiyun due to restrictions in a specific system, such as mounting conditions. 34*4882a593Smuzhiyun $ref: /schemas/types.yaml#definitions/uint32 35*4882a593Smuzhiyun 36*4882a593SmuzhiyunadditionalProperties: true 37