| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: MediaTek MT6370 Backlight |
| 8 | |
| 9 | maintainers: |
| 10 | - ChiaEn Wu <chiaen_wu@richtek.com> |
| 11 | |
| 12 | description: | |
| 13 | This module is part of the MT6370 MFD device. |
| 14 | The MT6370 Backlight WLED driver supports up to a 29V output voltage for |
| 15 | 4 channels of 8 series WLEDs. Each channel supports up to 30mA of current |
| 16 | capability with 2048 current steps (11 bits, only for MT6370/MT6371) or |
| 17 | 16384 current steps (14 bits, only for MT6372) in exponential or linear |
| 18 | mapping curves. |
| 19 | |
| 20 | allOf: |
| 21 | - $ref: common.yaml# |
| 22 | |
| 23 | properties: |
| 24 | compatible: |
| 25 | enum: |
| 26 | - mediatek,mt6370-backlight |
| 27 | - mediatek,mt6372-backlight |
| 28 | |
| 29 | default-brightness: |
| 30 | minimum: 0 |
| 31 | |
| 32 | max-brightness: |
| 33 | minimum: 0 |
| 34 | |
| 35 | enable-gpios: |
| 36 | description: External backlight 'enable' pin |
| 37 | maxItems: 1 |
| 38 | |
| 39 | mediatek,bled-pwm-enable: |
| 40 | description: | |
| 41 | Enable external PWM input for backlight dimming |
| 42 | type: boolean |
| 43 | |
| 44 | mediatek,bled-pwm-hys-enable: |
| 45 | description: | |
| 46 | Enable the backlight input-hysteresis for PWM mode |
| 47 | type: boolean |
| 48 | |
| 49 | mediatek,bled-pwm-hys-input-th-steps: |
| 50 | $ref: /schemas/types.yaml#/definitions/uint8 |
| 51 | enum: [1, 4, 16, 64] |
| 52 | description: | |
| 53 | The selection of the upper and lower bounds threshold of backlight |
| 54 | PWM resolution. If we choose selection 64, the variation of PWM |
| 55 | resolution needs more than 64 steps. |
| 56 | |
| 57 | mediatek,bled-ovp-shutdown: |
| 58 | description: | |
| 59 | Enable the backlight shutdown when OVP level triggered |
| 60 | type: boolean |
| 61 | |
| 62 | mediatek,bled-ovp-microvolt: |
| 63 | enum: [17000000, 21000000, 25000000, 29000000] |
| 64 | description: | |
| 65 | Backlight OVP level selection. |
| 66 | |
| 67 | mediatek,bled-ocp-shutdown: |
| 68 | description: | |
| 69 | Enable the backlight shutdown when OCP level triggered. |
| 70 | type: boolean |
| 71 | |
| 72 | mediatek,bled-ocp-microamp: |
| 73 | enum: [900000, 1200000, 1500000, 1800000] |
| 74 | description: | |
| 75 | Backlight OC level selection. |
| 76 | |
| 77 | mediatek,bled-exponential-mode-enable: |
| 78 | description: | |
| 79 | Enable the exponential mode of backlight brightness. If this property |
| 80 | is not enabled, the default is to use linear mode. |
| 81 | type: boolean |
| 82 | |
| 83 | mediatek,bled-channel-use: |
| 84 | $ref: /schemas/types.yaml#/definitions/uint8 |
| 85 | description: | |
| 86 | Backlight LED channel to be used. |
| 87 | Each bit mapping to: |
| 88 | - 0: CH4 |
| 89 | - 1: CH3 |
| 90 | - 2: CH2 |
| 91 | - 3: CH1 |
| 92 | minimum: 1 |
| 93 | maximum: 15 |
| 94 | |
| 95 | if: |
| 96 | properties: |
| 97 | compatible: |
| 98 | contains: |
| 99 | const: mediatek,mt6372-backlight |
| 100 | |
| 101 | then: |
| 102 | properties: |
| 103 | default-brightness: |
| 104 | maximum: 16384 |
| 105 | |
| 106 | max-brightness: |
| 107 | maximum: 16384 |
| 108 | |
| 109 | else: |
| 110 | properties: |
| 111 | default-brightness: |
| 112 | maximum: 2048 |
| 113 | |
| 114 | max-brightness: |
| 115 | maximum: 2048 |
| 116 | |
| 117 | required: |
| 118 | - compatible |
| 119 | - mediatek,bled-channel-use |
| 120 | |
| 121 | additionalProperties: false |