xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/watchdog/arm,sp805.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: ARM AMBA Primecell SP805 Watchdog

maintainers:
  - Viresh Kumar <vireshk@kernel.org>

description: |+
  The Arm SP805 IP implements a watchdog device, which triggers an interrupt
  after a configurable time period. If that interrupt has not been serviced
  when the next interrupt would be triggered, the reset signal is asserted.

allOf:
  - $ref: /schemas/watchdog/watchdog.yaml#

# Need a custom select here or 'arm,primecell' will match on lots of nodes
select:
  properties:
    compatible:
      contains:
        const: arm,sp805
  required:
    - compatible

properties:
  compatible:
    items:
      - const: arm,sp805
      - const: arm,primecell

  interrupts:
    maxItems: 1

  reg:
    maxItems: 1

  clocks:
    description: |
      Clocks driving the watchdog timer hardware. The first clock is used
      for the actual watchdog counter. The second clock drives the register
      interface.
    minItems: 2
    maxItems: 2

  clock-names:
    items:
      - const: wdog_clk
      - const: apb_pclk

required:
  - compatible
  - reg
  - clocks
  - clock-names

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    watchdog@66090000 {
        compatible = "arm,sp805", "arm,primecell";
        reg = <0x66090000 0x1000>;
        interrupts = <GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&wdt_clk>, <&apb_pclk>;
        clock-names = "wdog_clk", "apb_pclk";
    };