dt-bindings: backlight: Add MPS MP3309C

# 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 (default)

  - PWM controlled mode.

  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

  - max-brightness

  - default-brightness

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 */

            max-brightness = <100>;

            default-brightness = <80>;

            mps,overvoltage-protection-microvolt = <24000000>;

        };

    };