dt-bindings: spi: Convert spi-pxa2xx to json-schema

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

# Copyright 2019,2020 Lubomir Rintel <lkundrak@v3.sk>

%YAML 1.2

---

$id: http://devicetree.org/schemas/spi/marvell,mmp2-ssp.yaml#

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

title: PXA2xx SSP SPI Controller bindings

maintainers:

  - Lubomir Rintel <lkundrak@v3.sk>

allOf:

  - $ref: spi-controller.yaml#

properties:

  compatible:

    const: marvell,mmp2-ssp

  interrupts:

    maxItems: 1

  reg:

    maxItems: 1

  clocks:

    maxItems: 1

  ready-gpios:

    description: |

      GPIO used to signal a SPI master that the FIFO is filled and we're

      ready to service a transfer. Only useful in slave mode.

    maxItems: 1

required:

  - compatible

  - reg

  - interrupts

  - clocks

dependencies:

  ready-gpios: [ spi-slave ]

unevaluatedProperties: false

examples:

  - |

    #include <dt-bindings/clock/marvell,mmp2.h>

    spi@d4035000 {

        compatible = "marvell,mmp2-ssp";

        #address-cells = <1>;

        #size-cells = <0>;

        reg = <0xd4035000 0x1000>;

        clocks = <&soc_clocks MMP2_CLK_SSP0>;

        interrupts = <0>;

    };

...

PXA2xx SSP SPI Controller

Required properties:

- compatible: Must be "marvell,mmp2-ssp".

- reg: Offset and length of the device's register set.

- interrupts: Should be the interrupt number.

- clocks: Should contain a single entry describing the clock input.

- #address-cells:  Number of cells required to define a chip select address.

- #size-cells: Should be zero.

Optional properties:

- cs-gpios: list of GPIO chip selects. See the SPI bus bindings,

  Documentation/devicetree/bindings/spi/spi-bus.txt

- spi-slave: Empty property indicating the SPI controller is used in slave mode.

- ready-gpios: GPIO used to signal a SPI master that the FIFO is filled

  and we're ready to service a transfer. Only useful in slave mode.

Child nodes represent devices on the SPI bus

  See ../spi/spi-bus.txt

Example:

	ssp1: spi@d4035000 {

		compatible = "marvell,mmp2-ssp";

		reg = <0xd4035000 0x1000>;

		clocks = <&soc_clocks MMP2_CLK_SSP0>;

		interrupts = <0>;

	};