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90 lines
2.3 KiB
90 lines
2.3 KiB
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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%YAML 1.2 |
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--- |
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$id: http://devicetree.org/schemas/mfd/richtek,rt4831.yaml# |
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$schema: http://devicetree.org/meta-schemas/core.yaml# |
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title: Richtek RT4831 DSV and Backlight Integrated IC |
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maintainers: |
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- ChiYuan Huang <[email protected]> |
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description: | |
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RT4831 is a multifunctional device that can provide power to the LCD display |
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and LCD backlight. |
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For Display Bias Voltage DSVP and DSVN, the output range is about 4V to 6.5V. |
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It's sufficient to meet the current LCD power requirement. |
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For the LCD backlight, it can provide four channel WLED driving capability. |
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Each channel driving current is up to 30mA |
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Datasheet is available at |
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https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf |
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properties: |
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compatible: |
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const: richtek,rt4831 |
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reg: |
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description: I2C device address. |
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maxItems: 1 |
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enable-gpios: |
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description: | |
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GPIO to enable/disable the chip. It is optional. |
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Some usage directly tied this pin to follow VIO 1.8V power on sequence. |
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maxItems: 1 |
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regulators: |
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$ref: ../regulator/richtek,rt4831-regulator.yaml |
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backlight: |
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$ref: ../leds/backlight/richtek,rt4831-backlight.yaml |
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required: |
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- compatible |
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- reg |
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additionalProperties: false |
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examples: |
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- | |
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#include <dt-bindings/leds/rt4831-backlight.h> |
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i2c { |
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#address-cells = <1>; |
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#size-cells = <0>; |
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rt4831@11 { |
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compatible = "richtek,rt4831"; |
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reg = <0x11>; |
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regulators { |
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DSVLCM { |
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regulator-min-microvolt = <4000000>; |
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regulator-max-microvolt = <7150000>; |
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regulator-allow-bypass; |
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}; |
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DSVP { |
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regulator-name = "rt4831-dsvp"; |
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regulator-min-microvolt = <4000000>; |
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regulator-max-microvolt = <6500000>; |
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regulator-boot-on; |
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}; |
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DSVN { |
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regulator-name = "rt4831-dsvn"; |
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regulator-min-microvolt = <4000000>; |
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regulator-max-microvolt = <6500000>; |
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regulator-boot-on; |
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}; |
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}; |
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backlight { |
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compatible = "richtek,rt4831-backlight"; |
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default-brightness = <1024>; |
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max-brightness = <2048>; |
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richtek,bled-ovp-sel = /bits/ 8 <RT4831_BLOVPLVL_21V>; |
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richtek,channel-use = /bits/ 8 <RT4831_BLED_ALLCHEN>; |
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}; |
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}; |
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};
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