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
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