Bindings/leds/backlight/mediatek,mt6370-backlight.yaml

   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