dt-bindings: input: Convert imx keypad to json-schema

* Freescale i.MX Keypad Port(KPP) device tree bindings

The KPP is designed to interface with a keypad matrix with 2-point contact

or 3-point contact keys. The KPP is designed to simplify the software task

of scanning a keypad matrix. The KPP is capable of detecting, debouncing,

and decoding one or multiple keys pressed simultaneously on a keypad.

Required SoC Specific Properties:

- compatible: Should be "fsl,<soc>-kpp".

- reg: Physical base address of the KPP and length of memory mapped

  region.

- interrupts: The KPP interrupt number to the CPU(s).

- clocks: The clock provided by the SoC to the KPP. Some SoCs use dummy

clock(The clock for the KPP is provided by the SoCs automatically).

Required Board Specific Properties:

- pinctrl-names: The definition can be found at

pinctrl/pinctrl-bindings.txt.

- pinctrl-0: The definition can be found at

pinctrl/pinctrl-bindings.txt.

- linux,keymap: The definition can be found at

bindings/input/matrix-keymap.txt.

Example:

kpp: kpp@73f94000 {

	compatible = "fsl,imx51-kpp", "fsl,imx21-kpp";

	reg = <0x73f94000 0x4000>;

	interrupts = <60>;

	clocks = <&clks 0>;

	pinctrl-names = "default";

	pinctrl-0 = <&pinctrl_kpp_1>;

	linux,keymap = <0x00000067	/* KEY_UP */

			0x0001006c	/* KEY_DOWN */

			0x00020072	/* KEY_VOLUMEDOWN */

			0x00030066	/* KEY_HOME */

			0x0100006a	/* KEY_RIGHT */

			0x01010069	/* KEY_LEFT */

			0x0102001c	/* KEY_ENTER */

			0x01030073	/* KEY_VOLUMEUP */

			0x02000040	/* KEY_F6 */

			0x02010042	/* KEY_F8 */

			0x02020043	/* KEY_F9 */

			0x02030044	/* KEY_F10 */

			0x0300003b	/* KEY_F1 */

			0x0301003c	/* KEY_F2 */

			0x0302003d	/* KEY_F3 */

			0x03030074>;	/* KEY_POWER */

};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/input/imx-keypad.yaml#

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

title: Freescale i.MX Keypad Port(KPP) device tree bindings

maintainers:

  - Liu Ying <gnuiyl@gmail.com>

allOf:

  - $ref: "/schemas/input/matrix-keymap.yaml#"

description: |

  The KPP is designed to interface with a keypad matrix with 2-point contact

  or 3-point contact keys. The KPP is designed to simplify the software task

  of scanning a keypad matrix. The KPP is capable of detecting, debouncing,

  and decoding one or multiple keys pressed simultaneously on a keypad.

properties:

  compatible:

    oneOf:

      - const: fsl,imx21-kpp

      - items:

          - enum:

            - fsl,imx25-kpp

            - fsl,imx27-kpp

            - fsl,imx31-kpp

            - fsl,imx35-kpp

            - fsl,imx51-kpp

            - fsl,imx53-kpp

            - fsl,imx50-kpp

            - fsl,imx6q-kpp

            - fsl,imx6sx-kpp

            - fsl,imx6sl-kpp

            - fsl,imx6sll-kpp

            - fsl,imx6ul-kpp

            - fsl,imx7d-kpp

          - const: fsl,imx21-kpp

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    maxItems: 1

required:

  - compatible

  - reg

  - interrupts

  - clocks

  - linux,keymap

unevaluatedProperties: false

examples:

  - |

    keypad@73f94000 {

        compatible = "fsl,imx51-kpp", "fsl,imx21-kpp";

        reg = <0x73f94000 0x4000>;

        interrupts = <60>;

        clocks = <&clks 0>;

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_kpp_1>;

        linux,keymap = <0x00000067	/* KEY_UP */

                        0x0001006c	/* KEY_DOWN */

                        0x00020072	/* KEY_VOLUMEDOWN */

                        0x00030066	/* KEY_HOME */

                        0x0100006a	/* KEY_RIGHT */

                        0x01010069	/* KEY_LEFT */

                        0x0102001c	/* KEY_ENTER */

                        0x01030073	/* KEY_VOLUMEUP */

                        0x02000040	/* KEY_F6 */

                        0x02010042	/* KEY_F8 */

                        0x02020043	/* KEY_F9 */

                        0x02030044	/* KEY_F10 */

                        0x0300003b	/* KEY_F1 */

                        0x0301003c	/* KEY_F2 */

                        0x0302003d	/* KEY_F3 */

                        0x03030074>;	/* KEY_POWER */

    };