dt-bindings: i2c: Convert mxs i2c to json-schema

* Freescale MXS Inter IC (I2C) Controller

Required properties:

- compatible: Should be "fsl,<chip>-i2c"

- reg: Should contain registers location and length

- interrupts: Should contain ERROR interrupt number

- clock-frequency: Desired I2C bus clock frequency in Hz.

                   Only 100000Hz and 400000Hz modes are supported.

- dmas: DMA specifier, consisting of a phandle to DMA controller node

  and I2C DMA channel ID.

  Refer to dma.txt and fsl-mxs-dma.txt for details.

- dma-names: Must be "rx-tx".

Examples:

i2c0: i2c@80058000 {

	#address-cells = <1>;

	#size-cells = <0>;

	compatible = "fsl,imx28-i2c";

	reg = <0x80058000 2000>;

	interrupts = <111>;

	clock-frequency = <100000>;

	dmas = <&dma_apbx 6>;

	dma-names = "rx-tx";

};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/i2c/i2c-mxs.yaml#

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

title: Freescale MXS Inter IC (I2C) Controller

maintainers:

  - Shawn Guo <shawn.guo@linaro.org>

properties:

  compatible:

    enum:

      - fsl,imx23-i2c

      - fsl,imx28-i2c

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clock-frequency:

    enum: [ 100000, 400000 ]

  dmas:

    maxItems: 1

  dma-names:

    const: rx-tx

required:

  - compatible

  - reg

  - interrupts

  - dmas

  - dma-names

additionalProperties: false

examples:

  - |

    i2c@80058000 {

        compatible = "fsl,imx28-i2c";

        reg = <0x80058000 2000>;

        interrupts = <111>;

        clock-frequency = <100000>;

        dmas = <&dma_apbx 6>;

        dma-names = "rx-tx";

    };