dt-bindings: backlight: Add Kinetic KTD253 bindings

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd253.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Kinetic Technologies KTD253 one-wire backlight

maintainers:

  - Linus Walleij <linus.walleij@linaro.org>

description: |

  The Kinetic Technologies KTD253 is a white LED backlight that is

  controlled by a single GPIO line. If you just turn on the backlight

  it goes to maximum backlight then you can set the level of backlight

  using pulses on the enable wire. This is sometimes referred to as

  "expresswire".

allOf:

  - $ref: common.yaml#

properties:

  compatible:

    const: kinetic,ktd253

  enable-gpios:

    description: GPIO to use to enable/disable and dim the backlight.

    maxItems: 1

  default-brightness: true

  max-brightness: true

required:

  - compatible

  - enable-gpios

additionalProperties: false

examples:

  - |

    #include <dt-bindings/gpio/gpio.h>

    backlight {

        compatible = "kinetic,ktd253";

        enable-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;

        default-brightness = <13>;

    };