| # 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 triggered. |
| 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 |
