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