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

* Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX

Required properties:

- compatible :

  - "fsl,imx1-i2c" for I2C compatible with the one integrated on i.MX1 SoC

  - "fsl,imx21-i2c" for I2C compatible with the one integrated on i.MX21 SoC

  - "fsl,vf610-i2c" for I2C compatible with the one integrated on Vybrid vf610 SoC

- reg : Should contain I2C/HS-I2C registers location and length

- interrupts : Should contain I2C/HS-I2C interrupt

- clocks : Should contain the I2C/HS-I2C clock specifier

Optional properties:

- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz.

  The absence of the property indicates the default frequency 100 kHz.

- dmas: A list of two dma specifiers, one for each entry in dma-names.

- dma-names: should contain "tx" and "rx".

- scl-gpios: specify the gpio related to SCL pin

- sda-gpios: specify the gpio related to SDA pin

- pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c

  bus recovery, call it "gpio" state

Examples:

i2c@83fc4000 { /* I2C2 on i.MX51 */

	compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";

	reg = <0x83fc4000 0x4000>;

	interrupts = <63>;

};

i2c@70038000 { /* HS-I2C on i.MX51 */

	compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";

	reg = <0x70038000 0x4000>;

	interrupts = <64>;

	clock-frequency = <400000>;

};

i2c0: i2c@40066000 { /* i2c0 on vf610 */

	compatible = "fsl,vf610-i2c";

	reg = <0x40066000 0x1000>;

	interrupts =<0 71 0x04>;

	dmas = <&edma0 0 50>,

		<&edma0 0 51>;

	dma-names = "rx","tx";

	pinctrl-names = "default", "gpio";

	pinctrl-0 = <&pinctrl_i2c1>;

	pinctrl-1 = <&pinctrl_i2c1_gpio>;

	scl-gpios = <&gpio5 26 GPIO_ACTIVE_HIGH>;

	sda-gpios = <&gpio5 27 GPIO_ACTIVE_HIGH>;

};

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

%YAML 1.2

---

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

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

title: Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX

maintainers:

  - Wolfram Sang <wolfram@the-dreams.de>

properties:

  compatible:

    oneOf:

      - const: fsl,imx1-i2c

      - const: fsl,imx21-i2c

      - const: fsl,vf610-i2c

      - items:

          - const: fsl,imx35-i2c

          - const: fsl,imx1-i2c

      - items:

          - enum:

            - fsl,imx25-i2c

            - fsl,imx27-i2c

            - fsl,imx31-i2c

            - fsl,imx50-i2c

            - fsl,imx51-i2c

            - fsl,imx53-i2c

            - fsl,imx6q-i2c

            - fsl,imx6sl-i2c

            - fsl,imx6sx-i2c

            - fsl,imx6sll-i2c

            - fsl,imx6ul-i2c

            - fsl,imx7s-i2c

            - fsl,imx8mq-i2c

            - fsl,imx8mm-i2c

            - fsl,imx8mn-i2c

            - fsl,imx8mp-i2c

          - const: fsl,imx21-i2c

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    maxItems: 1

  clock-names:

    const: ipg

  clock-frequency:

    enum: [ 100000, 400000 ]

  dmas:

    items:

      - description: DMA controller phandle and request line for RX

      - description: DMA controller phandle and request line for TX

  dma-names:

    items:

      - const: rx

      - const: tx

  sda-gpios:

    maxItems: 1

  scl-gpios:

    maxItems: 1

required:

  - compatible

  - reg

  - interrupts

  - clocks

additionalProperties: false

examples:

  - |

    #include <dt-bindings/clock/imx5-clock.h>

    #include <dt-bindings/clock/vf610-clock.h>

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

    #include <dt-bindings/interrupt-controller/arm-gic.h>

    i2c@83fc4000 {

        compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";

        reg = <0x83fc4000 0x4000>;

        interrupts = <63>;

        clocks = <&clks IMX5_CLK_I2C2_GATE>;

    };

    i2c@40066000 {

        compatible = "fsl,vf610-i2c";

        reg = <0x40066000 0x1000>;

        interrupts = <71 IRQ_TYPE_LEVEL_HIGH>;

        clocks = <&clks VF610_CLK_I2C0>;

        clock-names = "ipg";

        dmas = <&edma0 0 50>,

               <&edma0 0 51>;

        dma-names = "rx", "tx";

    };