184943d6fSEmmanuel Vadot# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) 284943d6fSEmmanuel Vadot%YAML 1.2 384943d6fSEmmanuel Vadot--- 484943d6fSEmmanuel Vadot$id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml# 584943d6fSEmmanuel Vadot$schema: http://devicetree.org/meta-schemas/core.yaml# 684943d6fSEmmanuel Vadot 784943d6fSEmmanuel Vadottitle: MPS MP3309C backlight 884943d6fSEmmanuel Vadot 984943d6fSEmmanuel Vadotmaintainers: 1084943d6fSEmmanuel Vadot - Flavio Suligoi <f.suligoi@asem.it> 1184943d6fSEmmanuel Vadot 1284943d6fSEmmanuel Vadotdescription: | 1384943d6fSEmmanuel Vadot The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a 1484943d6fSEmmanuel Vadot programmable switching frequency to optimize efficiency. 1584943d6fSEmmanuel Vadot It supports two different dimming modes: 1684943d6fSEmmanuel Vadot 17*8d13bc63SEmmanuel Vadot - analog mode, via I2C commands, as default mode (32 dimming levels) 18*8d13bc63SEmmanuel Vadot - PWM controlled mode (optional) 1984943d6fSEmmanuel Vadot 2084943d6fSEmmanuel Vadot The datasheet is available at: 2184943d6fSEmmanuel Vadot https://www.monolithicpower.com/en/mp3309c.html 2284943d6fSEmmanuel Vadot 2384943d6fSEmmanuel VadotallOf: 2484943d6fSEmmanuel Vadot - $ref: common.yaml# 2584943d6fSEmmanuel Vadot 2684943d6fSEmmanuel Vadotproperties: 2784943d6fSEmmanuel Vadot compatible: 2884943d6fSEmmanuel Vadot const: mps,mp3309c 2984943d6fSEmmanuel Vadot 3084943d6fSEmmanuel Vadot reg: 3184943d6fSEmmanuel Vadot maxItems: 1 3284943d6fSEmmanuel Vadot 3384943d6fSEmmanuel Vadot pwms: 3484943d6fSEmmanuel Vadot description: if present, the backlight is controlled in PWM mode. 3584943d6fSEmmanuel Vadot maxItems: 1 3684943d6fSEmmanuel Vadot 3784943d6fSEmmanuel Vadot enable-gpios: 3884943d6fSEmmanuel Vadot description: GPIO used to enable the backlight in "analog-i2c" dimming mode. 3984943d6fSEmmanuel Vadot maxItems: 1 4084943d6fSEmmanuel Vadot 4184943d6fSEmmanuel Vadot mps,overvoltage-protection-microvolt: 4284943d6fSEmmanuel Vadot description: Overvoltage protection (13.5V, 24V or 35.5V). 4384943d6fSEmmanuel Vadot enum: [ 13500000, 24000000, 35500000 ] 4484943d6fSEmmanuel Vadot default: 35500000 4584943d6fSEmmanuel Vadot 4684943d6fSEmmanuel Vadot mps,no-sync-mode: 4784943d6fSEmmanuel Vadot description: disable synchronous rectification mode 4884943d6fSEmmanuel Vadot type: boolean 4984943d6fSEmmanuel Vadot 5084943d6fSEmmanuel Vadotrequired: 5184943d6fSEmmanuel Vadot - compatible 5284943d6fSEmmanuel Vadot - reg 5384943d6fSEmmanuel Vadot 5484943d6fSEmmanuel VadotunevaluatedProperties: false 5584943d6fSEmmanuel Vadot 5684943d6fSEmmanuel Vadotexamples: 5784943d6fSEmmanuel Vadot - | 5884943d6fSEmmanuel Vadot i2c { 5984943d6fSEmmanuel Vadot #address-cells = <1>; 6084943d6fSEmmanuel Vadot #size-cells = <0>; 6184943d6fSEmmanuel Vadot 6284943d6fSEmmanuel Vadot /* Backlight with PWM control */ 6384943d6fSEmmanuel Vadot backlight_pwm: backlight@17 { 6484943d6fSEmmanuel Vadot compatible = "mps,mp3309c"; 6584943d6fSEmmanuel Vadot reg = <0x17>; 6684943d6fSEmmanuel Vadot pwms = <&pwm1 0 3333333 0>; /* 300 Hz --> (1/f) * 1*10^9 */ 67*8d13bc63SEmmanuel Vadot brightness-levels = <0 4 8 16 32 64 128 255>; 68*8d13bc63SEmmanuel Vadot default-brightness = <6>; 6984943d6fSEmmanuel Vadot mps,overvoltage-protection-microvolt = <24000000>; 7084943d6fSEmmanuel Vadot }; 7184943d6fSEmmanuel Vadot }; 72