dt-bindings: watchdog: Convert DW WDT binding to DT schema

Synopsys Designware Watchdog Timer

Required Properties:

- compatible	: Should contain "snps,dw-wdt"

- reg		: Base address and size of the watchdog timer registers.

- clocks	: phandle + clock-specifier for the clock that drives the

		watchdog timer.

Optional Properties:

- interrupts	: The interrupt used for the watchdog timeout warning.

- resets	: phandle pointing to the system reset controller with

		line index for the watchdog.

Example:

	watchdog0: wd@ffd02000 {

		compatible = "snps,dw-wdt";

		reg = <0xffd02000 0x1000>;

		interrupts = <0 171 4>;

		clocks = <&per_base_clk>;

		resets = <&rst WDT0_RESET>;

	};

# SPDX-License-Identifier: GPL-2.0-only

%YAML 1.2

---

$id: http://devicetree.org/schemas/watchdog/snps,dw-wdt.yaml#

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

title: Synopsys Designware Watchdog Timer

allOf:

  - $ref: "watchdog.yaml#"

maintainers:

  - Jamie Iles <jamie@jamieiles.com>

properties:

  compatible:

    const: snps,dw-wdt

  reg:

    maxItems: 1

  interrupts:

    description: DW Watchdog pre-timeout interrupt

    maxItems: 1

  clocks:

    items:

      - description: Watchdog timer reference clock

  resets:

    description: Phandle to the DW Watchdog reset lane

    maxItems: 1

unevaluatedProperties: false

required:

  - compatible

  - reg

  - clocks

examples:

  - |

    watchdog@ffd02000 {

      compatible = "snps,dw-wdt";

      reg = <0xffd02000 0x1000>;

      interrupts = <0 171 4>;

      clocks = <&per_base_clk>;

      resets = <&wdt_rst>;

    };

...