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
7 title: MPS MP3309C backlight
8
9 maintainers:
10 - Flavio Suligoi <f.suligoi@asem.it>
11
12 description: |
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
23 allOf:
24 - $ref: common.yaml#
25
26 properties:
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
50 required:
51 - compatible
52 - reg
53
54 unevaluatedProperties: false
55
56 examples:
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 };
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