dt-bindings: add binding for tft displays based on ilitek,ili9486

# SPDX-License-Identifier: GPL-2.0-only

%YAML 1.2

---

$id: http://devicetree.org/schemas/display/ilitek,ili9486.yaml#

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

title: Ilitek ILI9486 display panels device tree bindings

maintainers:

  - Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>

description:

  This binding is for display panels using an Ilitek ILI9486 controller in SPI

  mode.

allOf:

  - $ref: panel/panel-common.yaml#

properties:

  compatible:

    items:

      - enum:

          # Waveshare 3.5" 320x480 Color TFT LCD

        - waveshare,rpi-lcd-35

          # Ozzmaker 3.5" 320x480 Color TFT LCD

        - ozzmaker,piscreen

      - const: ilitek,ili9486

  spi-max-frequency:

    maximum: 32000000

  dc-gpios:

    maxItems: 1

    description: Display data/command selection (D/CX)

  backlight: true

  reg: true

  reset-gpios: true

  rotation: true

required:

  - compatible

  - reg

  - dc-gpios

  - reset-gpios

additionalProperties: false

examples:

  - |

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

    backlight: backlight {

            compatible = "gpio-backlight";

            gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;

    };

    spi {

            #address-cells = <1>;

            #size-cells = <0>;

            display@0{

                    compatible = "waveshare,rpi-lcd-35", "ilitek,ili9486";

                    reg = <0>;

                    spi-max-frequency = <32000000>;

                    dc-gpios = <&gpio0 24 GPIO_ACTIVE_HIGH>;

                    reset-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;

                    rotation = <180>;

                    backlight = <&backlight>;

            };

    };

...