dt-bindings: i2c: Convert UniPhier I2C controller to json-schema

UniPhier I2C controller (FIFO-less)

Required properties:

- compatible: should be "socionext,uniphier-i2c".

- #address-cells: should be 1.

- #size-cells: should be 0.

- reg: offset and length of the register set for the device.

- interrupts: a single interrupt specifier.

- clocks: phandle to the input clock.

Optional properties:

- clock-frequency: desired I2C bus frequency in Hz.  The maximum supported

  value is 400000.  Defaults to 100000 if not specified.

Examples:

	i2c0: i2c@58400000 {

		compatible = "socionext,uniphier-i2c";

		reg = <0x58400000 0x40>;

		#address-cells = <1>;

		#size-cells = <0>;

		interrupts = <0 41 1>;

		clocks = <&i2c_clk>;

		clock-frequency = <100000>;

	};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/i2c/socionext,uniphier-i2c.yaml#

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

title: UniPhier I2C controller (FIFO-less)

maintainers:

  - Masahiro Yamada <yamada.masahiro@socionext.com>

allOf:

  - $ref: /schemas/i2c/i2c-controller.yaml#

properties:

  compatible:

    const: socionext,uniphier-i2c

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    maxItems: 1

  clock-frequency:

    minimum: 100000

    maximum: 400000

required:

  - compatible

  - reg

  - "#address-cells"

  - "#size-cells"

  - interrupts

  - clocks

examples:

  - |

    i2c0: i2c@58400000 {

        compatible = "socionext,uniphier-i2c";

        reg = <0x58400000 0x40>;

        #address-cells = <1>;

        #size-cells = <0>;

        interrupts = <0 41 1>;

        clocks = <&i2c_clk>;

        clock-frequency = <100000>;

    };