linux-kernel - Re: [PATCH v2 1/3] gpio: introduce utilities for synchronous fake device creation

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Message-ID: <CAMRc=Mecp9se3dTLkS6AokP3N=GHJ6CRNCuYipMfjd3crYkNWQ@mail.gmail.com>
Date: Thu, 20 Feb 2025 14:27:41 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Koichiro Den <koichiro.den@...onical.com>, linux-gpio@...r.kernel.org, 
	linus.walleij@...aro.org, maciej.borzecki@...onical.com, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] gpio: introduce utilities for synchronous fake
 device creation

On Thu, Feb 20, 2025 at 2:24 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Bartosz,
>
> On Thu, 20 Feb 2025 at 12:06, Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > On Tue, Feb 18, 2025 at 5:04 PM Koichiro Den <koichiro.den@...onical.com> wrote:
> > > Both gpio-sim and gpio-virtuser share a mechanism to instantiate a
> > > platform device, wait for probe completion, and retrieve the probe
> > > success or error status synchronously. With gpio-aggregator planned to
> > > adopt this approach for its configfs interface, it's time to factor
> > > out the common code.
> > >
> > > Add dev-sync-probe.[ch] to house helper functions used by all such
> > > implementations.
> > >
> > > No functional change.
> > >
> > > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
>
> > > --- a/drivers/gpio/Kconfig
> > > +++ b/drivers/gpio/Kconfig
> > > @@ -1863,6 +1863,13 @@ config GPIO_MPSSE
> > >
> > >  endmenu
> > >
> > > +# This symbol is selected by drivers that need synchronous fake device creation
> >
> > This comment is unnecessary, please drop it.
> >
> > > +config DEV_SYNC_PROBE
> > > +       tristate "Utilities for synchronous fake device creation"
> >
> > Please don't make this available for users to select, this should be a
> > hidden symbol only to be selected by its users.
>
> It is still useful to make it visible for compile-testing, i.e.
>
>     tristate "Utilities for synchronous fake device creation" if COMPILE_TEST
>

I disagree, this will get plenty of coverage being used by three
virtual drivers.

> As it does not depend on GPIO at all, I think it should be moved
> to the end of the file, outside the big "if GPIOLIB ... endif" block.
>

Indeed. And eventually I'd like it moved to lib/ but that's for another time.

Bart

> > > +       help
> > > +         Common helper functions for drivers that need synchronous fake
> > > +         device creation.
> > > +
> > >  menu "Virtual GPIO drivers"
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds