Re: [PATCH v2 1/3] dt-bindings: rtc: add reset-source property

[Rasmus Villemoes]

On 17/12/2020 19.12, Uwe Kleine-König wrote:
> On Thu, Dec 17, 2020 at 10:51:08AM -0600, Rob Herring wrote:
>> On Fri, Dec 11, 2020 at 5:10 PM Rasmus Villemoes
>> <rasmus.villemoes@xxxxxxxxx> wrote:

>> I'm wondering how you solve which wdog to ping when there are multiple
>> without relying on numbering. I guess 'reset-source' will solve that
>> even if that's not your current fix. So I guess I'm fine with this.
> 
> I guess you'd need some udev magic that ensures that the right watchdog
> always gets the same number.

The thing is, my board only has one watchdog, and my userspace opens
/dev/watchdog (aka /dev/watchdog0). But when a driver suddenly exposes
another watchdog device [which happens to be non-functional], and that
just happens (probe order, link order, whatever) to be the first one
defined, things break.

Yes, in the general case one would need some udev rules to create
appropriate symlinks. But when there's only one actual device, and I
know that, using /dev/watchdog or /dev/watchdog0 is fine.

I'll resend cc'ing the dt mailing list, and taking into account the
stuff already in -next.

Thanks,
Rasmus