| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | |
| Tom Rini | 93743d2 | 2024-04-01 09:08:13 -0400 | [diff] [blame] | 17 | - analog mode, via I2C commands, as default mode (32 dimming levels) |
| 18 | - PWM controlled mode (optional) |
| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 |
| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 */ |
| Tom Rini | 93743d2 | 2024-04-01 09:08:13 -0400 | [diff] [blame] | 67 | brightness-levels = <0 4 8 16 32 64 128 255>; |
| 68 | default-brightness = <6>; |
| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 69 | mps,overvoltage-protection-microvolt = <24000000>; |
| 70 | }; |
| 71 | }; |