91 lines
2.3 KiB
YAML
91 lines
2.3 KiB
YAML
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# 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 <cy_huang@richtek.com>
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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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