linux-kernel - Re: [PATCH v3 09/38] gpio: add HAS

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Date:   Fri, 28 Apr 2023 16:41:24 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Bartosz Golaszewski <brgl@...ev.pl>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v3 09/38] gpio: add HAS_IOPORT dependencies

On Wed, 2023-03-15 at 09:42 +0100, Linus Walleij wrote:
> Hi Niklas,
> 
> thanks for your patch!
> 
> On Tue, Mar 14, 2023 at 1:12 PM Niklas Schnelle <schnelle@...ux.ibm.com> wrote:
> > 
> > In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> > not being declared. We thus need to add HAS_IOPORT as dependency for
> > those drivers using them.
> > 
> > Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> > Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> > ---
> >  drivers/gpio/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> > index 13be729710f2..5a874e67fc13 100644
> > --- a/drivers/gpio/Kconfig
> > +++ b/drivers/gpio/Kconfig
> > @@ -688,7 +688,7 @@ config GPIO_VISCONTI
> > 
> >  config GPIO_VX855
> >         tristate "VIA VX855/VX875 GPIO"
> > -       depends on (X86 || COMPILE_TEST) && PCI
> > +       depends on (X86 || COMPILE_TEST) && PCI && HAS_IOPORT
> 
> But is this the right fix? Further down in the Kconfig we have:
> 
> menu "Port-mapped I/O GPIO drivers"
>         depends on X86 # Unconditional I/O space access
> 
> config GPIO_I8255
>         tristate
>         select GPIO_REGMAP
> 
> (...)
> 
> Isn't the right fix to:
> 
> 1) Move this Kconfig entry (VX855) down under the Port-mapped /O drivers,
>    and then:
> 
> 2) Make the whole submenu for port-mapped IO drivers depend on
>    X86 && HAS_IOPORT
> 
> Yours,
> Linus Walleij

Makes sense I changed it to the above approach for v4. One thing this
makes me wonder is if then one should change the X86 dependency to at
least X86 || COMPILE_TEST or even remove it and rely on HAS_IOPORT. The
comment there at least suggests that it is there only for the I/O space
access.

Thanks,
Niklas