dt-bindings: spi: Convert imx cspi to json-schema

* Freescale (Enhanced) Configurable Serial Peripheral Interface

  (CSPI/eCSPI) for i.MX

Required properties:

- compatible :

  - "fsl,imx1-cspi" for SPI compatible with the one integrated on i.MX1

  - "fsl,imx21-cspi" for SPI compatible with the one integrated on i.MX21

  - "fsl,imx27-cspi" for SPI compatible with the one integrated on i.MX27

  - "fsl,imx31-cspi" for SPI compatible with the one integrated on i.MX31

  - "fsl,imx35-cspi" for SPI compatible with the one integrated on i.MX35

  - "fsl,imx51-ecspi" for SPI compatible with the one integrated on i.MX51

  - "fsl,imx53-ecspi" for SPI compatible with the one integrated on i.MX53 and later Soc

  - "fsl,imx8mq-ecspi" for SPI compatible with the one integrated on i.MX8MQ

  - "fsl,imx8mm-ecspi" for SPI compatible with the one integrated on i.MX8MM

  - "fsl,imx8mn-ecspi" for SPI compatible with the one integrated on i.MX8MN

  - "fsl,imx8mp-ecspi" for SPI compatible with the one integrated on i.MX8MP

- reg : Offset and length of the register set for the device

- interrupts : Should contain CSPI/eCSPI interrupt

- clocks : Clock specifiers for both ipg and per clocks.

- clock-names : Clock names should include both "ipg" and "per"

See the clock consumer binding,

	Documentation/devicetree/bindings/clock/clock-bindings.txt

Recommended properties:

- cs-gpios : GPIOs to use as chip selects, see spi-bus.txt.  While the native chip

select lines can be used, they appear to always generate a pulse between each

word of a transfer.  Most use cases will require GPIO based chip selects to

generate a valid transaction.

Optional properties:

- num-cs :  Number of total chip selects, see spi-bus.txt.

- dmas: DMA specifiers for tx and rx dma. See the DMA client binding,

Documentation/devicetree/bindings/dma/dma.txt.

- dma-names: DMA request names, if present, should include "tx" and "rx".

- fsl,spi-rdy-drctl: Integer, representing the value of DRCTL, the register

controlling the SPI_READY handling. Note that to enable the DRCTL consideration,

the SPI_READY mode-flag needs to be set too.

Valid values are: 0 (disabled), 1 (edge-triggered burst) and 2 (level-triggered burst).

Obsolete properties:

- fsl,spi-num-chipselects : Contains the number of the chipselect

Example:

ecspi@70010000 {

	#address-cells = <1>;

	#size-cells = <0>;

	compatible = "fsl,imx51-ecspi";

	reg = <0x70010000 0x4000>;

	interrupts = <36>;

	cs-gpios = <&gpio3 24 0>, /* GPIO3_24 */

		   <&gpio3 25 0>; /* GPIO3_25 */

	dmas = <&sdma 3 7 1>, <&sdma 4 7 2>;

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

	fsl,spi-rdy-drctl = <1>;

};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/spi/fsl-imx-cspi.yaml#

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

title: Freescale (Enhanced) Configurable Serial Peripheral Interface (CSPI/eCSPI) for i.MX

maintainers:

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

allOf:

  - $ref: "/schemas/spi/spi-controller.yaml#"

properties:

  compatible:

    oneOf:

      - const: fsl,imx1-cspi

      - const: fsl,imx21-cspi

      - const: fsl,imx27-cspi

      - const: fsl,imx31-cspi

      - const: fsl,imx35-cspi

      - const: fsl,imx51-ecspi

      - const: fsl,imx53-ecspi

      - items:

        - enum:

          - fsl,imx50-ecspi

          - fsl,imx6q-ecspi

          - fsl,imx6sx-ecspi

          - fsl,imx6sl-ecspi

          - fsl,imx6sll-ecspi

          - fsl,imx6ul-ecspi

          - fsl,imx7d-ecspi

          - fsl,imx8mq-ecspi

          - fsl,imx8mm-ecspi

          - fsl,imx8mn-ecspi

          - fsl,imx8mp-ecspi

        - const: fsl,imx51-ecspi

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    items:

      - description: SoC SPI ipg clock

      - description: SoC SPI per clock

  clock-names:

    items:

      - const: ipg

      - const: per

  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

  fsl,spi-rdy-drctl:

    $ref: /schemas/types.yaml#/definitions/uint32

    description: |

      Integer, representing the value of DRCTL, the register controlling

      the SPI_READY handling. Note that to enable the DRCTL consideration,

      the SPI_READY mode-flag needs to be set too.

      Valid values are: 0 (disabled), 1 (edge-triggered burst) and 2 (level-triggered burst).

    enum: [0, 1, 2]

required:

  - compatible

  - reg

  - interrupts

  - clocks

  - clock-names

unevaluatedProperties: false

examples:

  - |

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

    spi@70010000 {

        #address-cells = <1>;

        #size-cells = <0>;

        compatible = "fsl,imx51-ecspi";

        reg = <0x70010000 0x4000>;

        interrupts = <36>;

        clocks = <&clks IMX5_CLK_ECSPI1_IPG_GATE>,

                 <&clks IMX5_CLK_ECSPI1_PER_GATE>;

        clock-names = "ipg", "per";

    };