xref: /linux/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml (revision 2e21dee6a46a66e4c2ced778485e1044101edee4) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: MPS MP3309C backlight
8
9maintainers:
10  - Flavio Suligoi <f.suligoi@asem.it>
11
12description: |
13  The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a
14  programmable switching frequency to optimize efficiency.
15  It supports two different dimming modes:
16
17  - analog mode, via I2C commands, as default mode (32 dimming levels)
18  - PWM controlled mode (optional)
19
20  The datasheet is available at:
21  https://www.monolithicpower.com/en/mp3309c.html
22
23allOf:
24  - $ref: common.yaml#
25
26properties:
27  compatible:
28    const: mps,mp3309c
29
30  reg:
31    maxItems: 1
32
33  pwms:
34    description: if present, the backlight is controlled in PWM mode.
35    maxItems: 1
36
37  enable-gpios:
38    description: GPIO used to enable the backlight in "analog-i2c" dimming mode.
39    maxItems: 1
40
41  mps,overvoltage-protection-microvolt:
42    description: Overvoltage protection (13.5V, 24V or 35.5V).
43    enum: [ 13500000, 24000000, 35500000 ]
44    default: 35500000
45
46  mps,no-sync-mode:
47    description: disable synchronous rectification mode
48    type: boolean
49
50required:
51  - compatible
52  - reg
53
54unevaluatedProperties: false
55
56examples:
57  - |
58    i2c {
59        #address-cells = <1>;
60        #size-cells = <0>;
61
62        /* Backlight with PWM control */
63        backlight_pwm: backlight@17 {
64            compatible = "mps,mp3309c";
65            reg = <0x17>;
66            pwms = <&pwm1 0 3333333 0>; /* 300 Hz --> (1/f) * 1*10^9 */
67            brightness-levels = <0 4 8 16 32 64 128 255>;
68            default-brightness = <6>;
69            mps,overvoltage-protection-microvolt = <24000000>;
70        };
71    };
72