1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 $id: http://devicetree.org/schemas/mfd/richtek,rt4831.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Richtek RT4831 DSV and Backlight Integrated IC
10 - ChiYuan Huang <cy_huang@richtek.com>
13 RT4831 is a multifunctional device that can provide power to the LCD display
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.
19 For the LCD backlight, it can provide four channel WLED driving capability.
20 Each channel driving current is up to 30mA
22 Datasheet is available at
23 https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf
30 description: I2C device address.
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.
40 $ref: ../regulator/richtek,rt4831-regulator.yaml
43 $ref: ../leds/backlight/richtek,rt4831-backlight.yaml
49 additionalProperties: false
53 #include <dt-bindings/leds/rt4831-backlight.h>
59 compatible = "richtek,rt4831";
64 regulator-min-microvolt = <4000000>;
65 regulator-max-microvolt = <7150000>;
66 regulator-allow-bypass;
69 regulator-name = "rt4831-dsvp";
70 regulator-min-microvolt = <4000000>;
71 regulator-max-microvolt = <6500000>;
75 regulator-name = "rt4831-dsvn";
76 regulator-min-microvolt = <4000000>;
77 regulator-max-microvolt = <6500000>;
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>;