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- # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
- %YAML 1.2
- ---
- $id: http://devicetree.org/schemas/leds/backlight/common.yaml#
- $schema: http://devicetree.org/meta-schemas/core.yaml#
- title: Common backlight properties
- maintainers:
- - Lee Jones <lee@kernel.org>
- - Daniel Thompson <daniel.thompson@linaro.org>
- - Jingoo Han <jingoohan1@gmail.com>
- description:
- Backlight devices provide backlight for different types of graphical
- displays. They are typically but not necessarily implemented using a white
- LED powered by a boost converter.
- properties:
- default-brightness:
- description:
- The default brightness that should be applied to the LED by the operating
- system on start-up. The brightness should not exceed the brightness the
- LED can provide.
- $ref: /schemas/types.yaml#/definitions/uint32
- max-brightness:
- description:
- Normally the maximum brightness is determined by the hardware and this
- property is not required. This property is used to put a software limit
- on the brightness apart from what the driver says, as it could happen
- that a LED can be made so bright that it gets damaged or causes damage
- due to restrictions in a specific system, such as mounting conditions.
- $ref: /schemas/types.yaml#/definitions/uint32
- brightness-levels:
- description:
- Array of distinct brightness levels. The levels must be in the range
- accepted by the underlying LED device. Typically these are in the range
- from 0 to 255, but any range starting at 0 will do, as long as they are
- accepted by the LED.
- The 0 value means a 0% of brightness (darkest/off), while the last value
- in the array represents a full 100% brightness (brightest).
- If this array is not provided, the driver default mapping is used.
- $ref: /schemas/types.yaml#/definitions/uint32-array
- default-brightness-level:
- description:
- The default brightness level (index into the array defined by the
- "brightness-levels" property).
- $ref: /schemas/types.yaml#/definitions/uint32
- additionalProperties: true
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