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

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Message-ID: <CAMuHMdULzDfdg-7HBk1f-Z+AZ5L2WGUEiPMqtvk+bNSkLb38BQ@mail.gmail.com>
Date: Thu, 20 Feb 2025 14:24:41 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
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

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

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.

> > +       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