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: /schemas/regulator/richtek,rt4831-regulator.yaml
41
42 backlight:
43 $ref: /schemas/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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