[PATCH v2 4/4] watchdog/pseries-wdt: initial support for H_WATCHDOG-based watchdog timers

[Nathan Lynch]

Scott Cheloha <cheloha at linux.ibm.com> writes:
> PAPR v2.12 defines a new hypercall, H_WATCHDOG.  The hypercall permits
> guest control of one or more virtual watchdog timers.  The timers have
> millisecond granularity.  The guest is terminated when a timer
> expires.
>
> This patch adds a watchdog driver for these timers, "pseries-wdt".
>
> pseries_wdt_probe() currently assumes the existence of only one
> platform device and always assigns it watchdogNumber 1.  If we ever
> expose more than one timer to userspace we will need to devise a way
> to assign a distinct watchdogNumber to each platform device at device
> registration time.
>
> Signed-off-by: Scott Cheloha <cheloha at linux.ibm.com>

Reviewed-by: Nathan Lynch <nathanl at linux.ibm.com>