richtek,rt4831.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/mfd/richtek,rt4831.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Richtek RT4831 DSV and Backlight Integrated IC
    8 
    9 maintainers:
   10   - ChiYuan Huang <cy_huang@richtek.com>
   11 
   12 description: |
   13   RT4831 is a multifunctional device that can provide power to the LCD display
   14   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 30mA
   21 
   22   Datasheet is available at
   23   https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf
   24 
   25 properties:
   26   compatible:
   27     const: richtek,rt4831
   28 
   29   reg:
   30     description: I2C device address.
   31     maxItems: 1
   32 
   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: 1
   38 
   39   regulators:
   40     $ref: ../regulator/richtek,rt4831-regulator.yaml
   41 
   42   backlight:
   43     $ref: ../leds/backlight/richtek,rt4831-backlight.yaml
   44 
   45 required:
   46   - compatible
   47   - reg
   48 
   49 additionalProperties: false
   50 
   51 examples:
   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     };

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