Re: [PATCH 1/2] dt-bindings: watchdog: Add arm,smc-wdt watchdog arm,smc-wdt compatible

From: Guenter Roeck
Date: Fri Feb 21 2020 - 15:47:03 EST

On Fri, Feb 21, 2020 at 11:41:47AM -0800, Julius Werner wrote:
> > Because the ATF does not define standard wdt index, each vendor defines
> > its own index.
> > So I don't think that the current driver[0] can fully cover my usecases.
> I think the best way to solve this would be to put the SMC function ID
> as another field into the device tree, so that multiple vendors could
> share the same driver even if their firmware interface uses a
> different SMC. But they still have to implement the same API for that
> SMC, of course, not sure if the Meson driver is suitable for that (but
> if it is then I think merging those drivers would be a good idea).

More common would be to have a single driver and multiple compatible
strings. The driver would then pick the SMC function ID from the compatible
string. After all, we'd not only need the SMC function ID; parameters
are also different.