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@xxxxxxxxxxxxxxxxxxxx> 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?
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