Re: [PATCH v2 3/4] drivers: reset: Add STM32 reset driver

[Philipp Zabel]

Am Freitag, den 22.07.2016, 21:25 +0200 schrieb Arnd Bergmann:
> On Thursday, July 21, 2016 7:16:02 PM CEST Paul Gortmaker wrote:
> 
> > > > ...we probably don't need module.h here or any of the other
> > > > MODULE_<blah> tags/macros either.  Use the builtin for the
> > > > register and all should be good.
> > > 
> > > I wonder if we should have separate symbols for each reset driver
> > > instead. Those could be allowed to be tristate, and could also
> > > be enabled for compile testing on other architectures.
> > 
> > I'm not quite clear on what you mean by the above.  Maybe if you have a
> > pointer to an example -- say like the work you mention below -- then
> > I'll understand what you have in mind.
> 
> I mean instead of having each driver compiled implicitly when the
> ARCH_* symbol is enabled, make the drivers user-selectable
> and just default to 'y' when the platform is enabled. This would
> let us actually use modular reset drivers where appropriate
> (which might be nowhere, but at least we wouldn't forbid it
> for no reason).

I agree with this for the drivers that could be built as a module
(which is most of them).
I don't think it is useful for the builtin drivers to have user visible
Kconfig symbols.

> Another annoying thing is that all platforms today need to
> select two symbols
> 
>  	select ARCH_HAS_RESET_CONTROLLER
> 	select RESET_CONTROLLER
> 
> in order to actually build the driver, and the second one is
> user-selectable, meaning you can still disable all of them today,
> just not individual drivers.

RESET_CONTROLLER is default y if ARCH_HAS_RESET_CONTROLLER, so if
platforms select ARCH_HAS_RESET_CONTROLLER, that should be enough.

regards
Philipp