| # 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, as default mode (32 dimming levels) |
| - PWM controlled mode (optional) |
| |
| 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 |
| |
| 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 */ |
| brightness-levels = <0 4 8 16 32 64 128 255>; |
| default-brightness = <6>; |
| mps,overvoltage-protection-microvolt = <24000000>; |
| }; |
| }; |
