On Mon, Apr 15, 2019 at 12:52:01PM +0200, Wolfram Sang wrote:
> Support an already running watchdog by checking its enable bit and set
> up the status accordingly before registering the device.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

After second thought, I am getting confused a little. If the WDT is
already running then

a) before this patch: after successful probe, RPM will disable the
clock until userspace opens the watchdog device

b) after this patch: during probe, our default timeout will be
programmed and because of WDOG_HW_RUNNING, the core will generate pings
until userspace opens the watchdog device.

So, b) will protect from a crashing kernel (no pings anymore) but not
from something like missing rootfs, or?

The usecase I had in mind ("give the kernel <x> seconds to boot into
working userspace") seems to be achieved by loading the WDT driver as a
module then, I guess?