xref: /openbmc/linux/Documentation/devicetree/bindings/watchdog/xlnx,xps-timebase-wdt.yaml (revision d5c421d2)

# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/watchdog/xlnx,xps-timebase-wdt.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Xilinx AXI/PLB softcore and window Watchdog Timer

maintainers:
  - Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
  - Srinivas Neeli <srinivas.neeli@amd.com>

description:
  The Timebase watchdog timer(WDT) is a free-running 32 bit counter.
  WDT uses a dual-expiration architecture. After one expiration of
  the timeout interval, an interrupt is generated and the WDT state
  bit is set to one in the status register. If the state bit is not
  cleared (by writing a one to the state bit) before the next
  expiration of the timeout interval, a WDT reset is generated.

allOf:
  - $ref: watchdog.yaml#

properties:
  compatible:
    enum:
      - xlnx,xps-timebase-wdt-1.01.a
      - xlnx,xps-timebase-wdt-1.00.a

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  clock-frequency:
    description: Frequency of clock in Hz

  xlnx,wdt-interval:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: Watchdog timeout interval
    minimum: 8
    maximum: 32

  xlnx,wdt-enable-once:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1]
    description: If watchdog is configured as enable once,
                 then the watchdog cannot be disabled after
                 it has been enabled.

required:
  - compatible
  - reg

unevaluatedProperties: false

examples:
  - |
    watchdog@40100000 {
        compatible = "xlnx,xps-timebase-wdt-1.00.a";
        reg = <0x40100000 0x1000>;
        clock-frequency = <50000000>;
        clocks = <&clkc 15>;
        xlnx,wdt-enable-once = <0x0>;
        xlnx,wdt-interval = <0x1b>;
    };
...