dt-bindings: msm: Add haven watchdog documentation

%YAML 1.2

---

$id: http://devicetree.org/schemas/bindings/arm/msm/hh_watchdog.yaml#

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

title: QTI HH Watchdog

maintainers:

description: |+

  Watchdog timer is configured with a bark and a bite time.

  If the watchdog is not "pet" at regular intervals, the system

  is assumed to have become non responsive and needs to be reset.

  A warning in the form of a bark timeout leads to a bark interrupt

  and a kernel panic. If the watchdog timer is still not reset,

  a bite timeout occurs, which leads to a reset of the VM via

  the hypervisor. The driver needs the petting time, and the bark

  timeout to be programmed into the watchdog, as well as the bark irq.

  The device tree parameters for the watchdog are:

properties:

  compatible:

    Usage: required

    Value type: <string>

    Definition: Must be "qcom,hh-watchdog"

  interrupts:

     Usage: required

     Value type: <prop-encoded-array>

     Definition: should contain the bark irq number

example:

  - |

    wdog_hh: qcom,wdt_hh {

		    compatible = "qcom,hh-watchdog";

		    interrupts = <0 0 IRQ_TYPE_LEVEL_HIGH>;

	    };

...