Re: [PATCH v14 03/10] drm/display: Add Type-C switch helpers

[Andy Shevchenko]

On Wed, Mar 22, 2023 at 06:27:56PM +0200, Jani Nikula wrote:
> On Wed, 22 Mar 2023, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> > On Wed, Mar 22, 2023 at 06:46:32PM +0800, Pin-yen Lin wrote:
> >> +#ifdef CONFIG_DRM_DISPLAY_DP_TYPEC_HELPER
> >
> > Ah, maybe this should use IS_REACHABLE() ?
> 
> Personally, I think IS_REACHABLE() is a build-time band-aid solution to
> a problem that should be solved in Kconfig. :p
> 
> I think it always means there's a configuration combo that shouldn't
> exist, and it's a surprise to the user when they've configured
> something, Kconfig has deemed it a valid configuration, but they don't
> get the feature they want.
> 
> As a user, how would they even debug that case? Double check configs,
> don't see anything wrong.

Usual pairing is 'imply FOO' in Kconfig & 'IS_REACHEABLE(CONFIG_FOO)' in the
code. And I believe it's not an abnormal.

-- 
With Best Regards,
Andy Shevchenko