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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/mfd/richtek,rt4831.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Richtek RT4831 DSV and Backlight Integrated IC8 9maintainers:10 - ChiYuan Huang <cy_huang@richtek.com>11 12description: |13 RT4831 is a multifunctional device that can provide power to the LCD display14 and LCD backlight.15 16 For Display Bias Voltage DSVP and DSVN, the output range is about 4V to 6.5V.17 It's sufficient to meet the current LCD power requirement.18 19 For the LCD backlight, it can provide four channel WLED driving capability.20 Each channel driving current is up to 30mA21 22 Datasheet is available at23 https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf24 25properties:26 compatible:27 const: richtek,rt483128 29 reg:30 description: I2C device address.31 maxItems: 132 33 enable-gpios:34 description: |35 GPIO to enable/disable the chip. It is optional.36 Some usage directly tied this pin to follow VIO 1.8V power on sequence.37 maxItems: 138 39 regulators:40 $ref: /schemas/regulator/richtek,rt4831-regulator.yaml41 42 backlight:43 $ref: /schemas/leds/backlight/richtek,rt4831-backlight.yaml44 45required:46 - compatible47 - reg48 49additionalProperties: false50 51examples:52 - |53 #include <dt-bindings/leds/rt4831-backlight.h>54 i2c {55 #address-cells = <1>;56 #size-cells = <0>;57 58 rt4831@11 {59 compatible = "richtek,rt4831";60 reg = <0x11>;61 62 regulators {63 DSVLCM {64 regulator-min-microvolt = <4000000>;65 regulator-max-microvolt = <7150000>;66 regulator-allow-bypass;67 };68 DSVP {69 regulator-name = "rt4831-dsvp";70 regulator-min-microvolt = <4000000>;71 regulator-max-microvolt = <6500000>;72 regulator-boot-on;73 };74 DSVN {75 regulator-name = "rt4831-dsvn";76 regulator-min-microvolt = <4000000>;77 regulator-max-microvolt = <6500000>;78 regulator-boot-on;79 };80 };81 82 backlight {83 compatible = "richtek,rt4831-backlight";84 default-brightness = <1024>;85 max-brightness = <2048>;86 richtek,bled-ovp-sel = /bits/ 8 <RT4831_BLOVPLVL_21V>;87 richtek,channel-use = /bits/ 8 <RT4831_BLED_ALLCHEN>;88 };89 };90 };91