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backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight
Adds DT binding document for Richtek RT4831 backlight.
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
authored by
ChiYuan Huang
and committed by
Lee Jones
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a1649a52
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Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
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Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-backlight.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Richtek RT4831 Backlight
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maintainers:
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- ChiYuan Huang <cy_huang@richtek.com>
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description: |
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RT4831 is a mutifunctional device that can provide power to the LCD display
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and LCD backlight.
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For the LCD backlight, it can provide four channel WLED driving capability.
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Each channel driving current is up to 30mA
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Datasheet is available at
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https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf
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allOf:
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- $ref: common.yaml#
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properties:
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compatible:
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const: richtek,rt4831-backlight
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default-brightness:
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minimum: 0
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maximum: 2048
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max-brightness:
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minimum: 0
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maximum: 2048
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richtek,pwm-enable:
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description: |
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Specify the backlight dimming following by PWM duty or by SW control.
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type: boolean
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richtek,bled-ovp-sel:
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description: |
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Backlight OVP level selection, currently support 17V/21V/25V/29V.
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$ref: /schemas/types.yaml#/definitions/uint8
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default: 1
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minimum: 0
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maximum: 3
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richtek,channel-use:
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description: |
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Backlight LED channel to be used.
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BIT 0/1/2/3 is used to indicate led channel 1/2/3/4 enable or disable.
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$ref: /schemas/types.yaml#/definitions/uint8
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minimum: 1
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maximum: 15
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required:
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- compatible
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- richtek,channel-use
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additionalProperties: false
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include/dt-bindings/leds/rt4831-backlight.h
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include/dt-bindings/leds/rt4831-backlight.h
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/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
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/*
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* This header provides constants for rt4831 backlight bindings.
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*
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* Copyright (C) 2020, Richtek Technology Corp.
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* Author: ChiYuan Huang <cy_huang@richtek.com>
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*/
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#ifndef _DT_BINDINGS_RT4831_BACKLIGHT_H
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#define _DT_BINDINGS_RT4831_BACKLIGHT_H
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#define RT4831_BLOVPLVL_17V 0
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#define RT4831_BLOVPLVL_21V 1
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#define RT4831_BLOVPLVL_25V 2
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#define RT4831_BLOVPLVL_29V 3
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#define RT4831_BLED_CH1EN (1 << 0)
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#define RT4831_BLED_CH2EN (1 << 1)
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#define RT4831_BLED_CH3EN (1 << 2)
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#define RT4831_BLED_CH4EN (1 << 3)
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#define RT4831_BLED_ALLCHEN ((1 << 4) - 1)
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#endif /* _DT_BINDINGS_RT4831_BACKLIGHT_H */