dt-bindings: watchdog: Convert Samsung SoC watchdog bindings to json-schema

* Samsung's Watchdog Timer Controller

The Samsung's Watchdog controller is used for resuming system operation

after a preset amount of time during which the WDT reset event has not

occurred.

Required properties:

- compatible : should be one among the following

	- "samsung,s3c2410-wdt" for S3C2410

	- "samsung,s3c6410-wdt" for S3C6410, S5PV210 and Exynos4

	- "samsung,exynos5250-wdt" for Exynos5250

	- "samsung,exynos5420-wdt" for Exynos5420

	- "samsung,exynos7-wdt" for Exynos7

- reg : base physical address of the controller and length of memory mapped

	region.

- interrupts : interrupt number to the cpu.

- samsung,syscon-phandle : reference to syscon node (This property required only

	in case of compatible being "samsung,exynos5250-wdt" or "samsung,exynos5420-wdt".

	In case of Exynos5250 and 5420 this property points to syscon node holding the PMU

	base address)

Optional properties:

- timeout-sec : contains the watchdog timeout in seconds.

Example:

watchdog@101d0000 {

	compatible = "samsung,exynos5250-wdt";

	reg = <0x101D0000 0x100>;

	interrupts = <0 42 0>;

	clocks = <&clock 336>;

	clock-names = "watchdog";

	samsung,syscon-phandle = <&pmu_syscon>;

};

# SPDX-License-Identifier: GPL-2.0

%YAML 1.2

---

$id: http://devicetree.org/schemas/watchdog/samsung-wdt.yaml#

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

title: Samsung SoC Watchdog Timer Controller

maintainers:

  - Krzysztof Kozlowski <krzk@kernel.org>

description: |+

  The Samsung's Watchdog controller is used for resuming system operation

  after a preset amount of time during which the WDT reset event has not

  occurred.

properties:

  compatible:

    enum:

      - samsung,s3c2410-wdt                   # for S3C2410

      - samsung,s3c6410-wdt                   # for S3C6410, S5PV210 and Exynos4

      - samsung,exynos5250-wdt                # for Exynos5250

      - samsung,exynos5420-wdt                # for Exynos5420

      - samsung,exynos7-wdt                   # for Exynos7

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  samsung,syscon-phandle:

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

    description:

      Phandle to the PMU system controller node (in case of Exynos5250

      and Exynos5420).

required:

  - compatible

  - interrupts

  - reg

allOf:

  - $ref: watchdog.yaml#

  - if:

      properties:

        compatible:

          contains:

            enum:

              - samsung,exynos5250-wdt

              - samsung,exynos5420-wdt

    then:

      required:

        - samsung,syscon-phandle

examples:

  - |

    watchdog@101d0000 {

        compatible = "samsung,exynos5250-wdt";

        reg = <0x101D0000 0x100>;

        interrupts = <0 42 0>;

        clocks = <&clock 336>;

        clock-names = "watchdog";

        samsung,syscon-phandle = <&pmu_syscon>;

    };