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