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From:   Bartosz Golaszewski <brgl@bgdev.pl>
Date:   Fri, 22 Feb 2019 10:04:07 +0100
Message-ID: <CAMRc=Me0A6FHKUjuhsk9U-tHo7dLK4U0-NXk+M4129tLn3KV_w@mail.gmail.com>
Subject: Re: [PATCH] drivers: depend on HAS_IOMEM for devm_platform_ioremap_resource()
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Keerthy <j-keerthy@ti.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>
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czw., 21 lut 2019 o 20:56 Andy Shevchenko <andy.shevchenko@gmail.com>
napisa=C5=82(a):
>
> On Thu, Feb 21, 2019 at 9:55 PM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> >
> > On Thu, Feb 21, 2019 at 6:27 PM Bartosz Golaszewski <brgl@bgdev.pl> wro=
te:
> > >
> > > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > >
> > > We only build devm_ioremap_resource() if HAS_IOMEM is selected, so th=
is
> > > dependency must cascade down to devm_platform_ioremap_resource().
> >
> > > +#ifdef CONFIG_HAS_IOMEM
> > >  void __iomem *devm_platform_ioremap_resource(struct platform_device =
*pdev,
> > >                                              unsigned int index)
> > >  {
> > > @@ -96,6 +97,7 @@ void __iomem *devm_platform_ioremap_resource(struct=
 platform_device *pdev,
> > >         return devm_ioremap_resource(&pdev->dev, res);
> > >  }
> > >  EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
> > > +#endif /* CONFIG_HAS_IOMEM */
> >
> > What about declaration in *.h?
> >
> > Perhaps you may just do this inside the function?
>
> #ifdef ...
> #else
> return ERR_PTR(-ENOTSUPP);
> #endif
>

I followed the example of devm_ioremap_resource() which doesn't do
this - it just expects never to be used by systems without IOMEM.

Bart