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1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: MPS MP3309C backlight8 9maintainers:10 - Flavio Suligoi <f.suligoi@asem.it>11 12description: |13 The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a14 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.html22 23allOf:24 - $ref: common.yaml#25 26properties:27 compatible:28 const: mps,mp3309c29 30 reg:31 maxItems: 132 33 pwms:34 description: if present, the backlight is controlled in PWM mode.35 maxItems: 136 37 enable-gpios:38 description: GPIO used to enable the backlight in "analog-i2c" dimming mode.39 maxItems: 140 41 mps,overvoltage-protection-microvolt:42 description: Overvoltage protection (13.5V, 24V or 35.5V).43 enum: [ 13500000, 24000000, 35500000 ]44 default: 3550000045 46 mps,no-sync-mode:47 description: disable synchronous rectification mode48 type: boolean49 50required:51 - compatible52 - reg53 54unevaluatedProperties: false55 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