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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/leds/backlight/common.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Common backlight properties8 9maintainers:10 - Lee Jones <lee@kernel.org>11 - Daniel Thompson <daniel.thompson@linaro.org>12 - Jingoo Han <jingoohan1@gmail.com>13 14description:15 Backlight devices provide backlight for different types of graphical16 displays. They are typically but not necessarily implemented using a white17 LED powered by a boost converter.18 19properties:20 default-brightness:21 description:22 The default brightness that should be applied to the LED by the operating23 system on start-up. The brightness should not exceed the brightness the24 LED can provide.25 $ref: /schemas/types.yaml#/definitions/uint3226 27 max-brightness:28 description:29 Normally the maximum brightness is determined by the hardware and this30 property is not required. This property is used to put a software limit31 on the brightness apart from what the driver says, as it could happen32 that a LED can be made so bright that it gets damaged or causes damage33 due to restrictions in a specific system, such as mounting conditions.34 $ref: /schemas/types.yaml#/definitions/uint3235 36 brightness-levels:37 description:38 Array of distinct brightness levels. The levels must be in the range39 accepted by the underlying LED device. Typically these are in the range40 from 0 to 255, but any range starting at 0 will do, as long as they are41 accepted by the LED.42 The 0 value means a 0% of brightness (darkest/off), while the last value43 in the array represents a full 100% brightness (brightest).44 If this array is not provided, the driver default mapping is used.45 $ref: /schemas/types.yaml#/definitions/uint32-array46 47 default-brightness-level:48 description:49 The default brightness level (index into the array defined by the50 "brightness-levels" property).51 $ref: /schemas/types.yaml#/definitions/uint3252 53additionalProperties: true54