blob: 4191e33626f51ad3ccb5843e61caeb83eafea193 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: MPS MP3309C backlight
maintainers:
- Flavio Suligoi <f.suligoi@asem.it>
description: |
The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a
programmable switching frequency to optimize efficiency.
It supports two different dimming modes:
- analog mode, via I2C commands (default)
- PWM controlled mode.
The datasheet is available at:
https://www.monolithicpower.com/en/mp3309c.html
allOf:
- $ref: common.yaml#
properties:
compatible:
const: mps,mp3309c
reg:
maxItems: 1
pwms:
description: if present, the backlight is controlled in PWM mode.
maxItems: 1
enable-gpios:
description: GPIO used to enable the backlight in "analog-i2c" dimming mode.
maxItems: 1
mps,overvoltage-protection-microvolt:
description: Overvoltage protection (13.5V, 24V or 35.5V).
enum: [ 13500000, 24000000, 35500000 ]
default: 35500000
mps,no-sync-mode:
description: disable synchronous rectification mode
type: boolean
required:
- compatible
- reg
- max-brightness
- default-brightness
unevaluatedProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
/* Backlight with PWM control */
backlight_pwm: backlight@17 {
compatible = "mps,mp3309c";
reg = <0x17>;
pwms = <&pwm1 0 3333333 0>; /* 300 Hz --> (1/f) * 1*10^9 */
max-brightness = <100>;
default-brightness = <80>;
mps,overvoltage-protection-microvolt = <24000000>;
};
};
|
