122 lines
2.9 KiB
YAML
122 lines
2.9 KiB
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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$id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: MediaTek MT6370 Backlight
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maintainers:
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- ChiaEn Wu <chiaen_wu@richtek.com>
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description: |
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This module is part of the MT6370 MFD device.
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The MT6370 Backlight WLED driver supports up to a 29V output voltage for
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4 channels of 8 series WLEDs. Each channel supports up to 30mA of current
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capability with 2048 current steps (11 bits, only for MT6370/MT6371) or
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16384 current steps (14 bits, only for MT6372) in exponential or linear
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mapping curves.
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allOf:
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- $ref: common.yaml#
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properties:
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compatible:
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enum:
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- mediatek,mt6370-backlight
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- mediatek,mt6372-backlight
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default-brightness:
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minimum: 0
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max-brightness:
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minimum: 0
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enable-gpios:
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description: External backlight 'enable' pin
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maxItems: 1
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mediatek,bled-pwm-enable:
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description: |
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Enable external PWM input for backlight dimming
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type: boolean
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mediatek,bled-pwm-hys-enable:
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description: |
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Enable the backlight input-hysteresis for PWM mode
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type: boolean
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mediatek,bled-pwm-hys-input-th-steps:
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$ref: /schemas/types.yaml#/definitions/uint8
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enum: [1, 4, 16, 64]
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description: |
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The selection of the upper and lower bounds threshold of backlight
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PWM resolution. If we choose selection 64, the variation of PWM
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resolution needs more than 64 steps.
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mediatek,bled-ovp-shutdown:
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description: |
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Enable the backlight shutdown when OVP level triggered
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type: boolean
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mediatek,bled-ovp-microvolt:
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enum: [17000000, 21000000, 25000000, 29000000]
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description: |
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Backlight OVP level selection.
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mediatek,bled-ocp-shutdown:
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description: |
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Enable the backlight shutdown when OCP level triggerred.
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type: boolean
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mediatek,bled-ocp-microamp:
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enum: [900000, 1200000, 1500000, 1800000]
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description: |
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Backlight OC level selection.
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mediatek,bled-exponential-mode-enable:
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description: |
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Enable the exponential mode of backlight brightness. If this property
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is not enabled, the default is to use linear mode.
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type: boolean
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mediatek,bled-channel-use:
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$ref: /schemas/types.yaml#/definitions/uint8
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description: |
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Backlight LED channel to be used.
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Each bit mapping to:
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- 0: CH4
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- 1: CH3
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- 2: CH2
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- 3: CH1
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minimum: 1
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maximum: 15
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if:
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properties:
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compatible:
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contains:
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const: mediatek,mt6372-backlight
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then:
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properties:
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default-brightness:
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maximum: 16384
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max-brightness:
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maximum: 16384
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else:
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properties:
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default-brightness:
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maximum: 2048
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max-brightness:
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maximum: 2048
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required:
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- compatible
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- mediatek,bled-channel-use
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additionalProperties: false
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