linux-kernel - Re: [PATCH] iio: accel: fxls8962af: fix i2c dependency

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Message-ID: <CAK8P3a3SMGHvj2cywrPVQchJTmhvwq9ERsPDmV0E0K6zC0St5w@mail.gmail.com>
Date:   Wed, 21 Jul 2021 20:40:30 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Sean Nyekjaer <sean@...nix.com>, Arnd Bergmann <arnd@...db.de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Tomas Melin <tomas.melin@...sala.com>,
        Mike Looijmans <mike.looijmans@...ic.nl>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: accel: fxls8962af: fix i2c dependency

On Wed, Jul 21, 2021 at 7:34 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Wed, Jul 21, 2021 at 7:12 PM Arnd Bergmann <arnd@...nel.org> wrote:
> > On Wed, Jul 21, 2021 at 5:52 PM Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:
> > > On Wed, Jul 21, 2021 at 6:13 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> ...
>
> > > >  config FXLS8962AF
> > > >         tristate
> > > > +       depends on I2C || !I2C # cannot be built-in for modular I2C
> > >
> > > Can you enlighten me how this will not be a no-op?
> >
> > This part does nothing, it only causes a warning when FXLS8962AF
> > gets selected =y when I2C=m.
>
> This is something new to me. But shouldn't the other chunk guarantee
> that warning won't happen?

Correct, it works without that, but if that fails after something changes,
this version would provide better diagnostics than the FXLS8962AF
core driver causing a link failure, and I found it documents better
why the other driver needs the dependency.

Let me know if you prefer me to resend the patch without this hunk.

      Arnd