linux-kernel - Re: [PATCH] drivers: gpio: use of_match_ptr() and ACPI

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Message-ID: <CAHp75Vd9QUCcUoPLUW3kkJC0h=mPUqHNqNJPY74gDGSu67t8Hw@mail.gmail.com>
Date:   Wed, 18 Nov 2020 11:56:53 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        Jonathan Cameron <jic23@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-tegra@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Alban Bedel <albeu@...e.fr>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
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        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH] drivers: gpio: use of_match_ptr() and ACPI_PTR() macros

On Wed, Nov 18, 2020 at 11:54 AM Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
> On Tue, Nov 17, 2020 at 06:45:37PM +0200, Andy Shevchenko wrote:
> > On Tue, Nov 17, 2020 at 5:45 PM Enrico Weigelt, metux IT consult
> > <info@...ux.net> wrote:
> > >
> > > The of_match_ptr(foo) macro evaluates to foo, only if
> > > CONFIG_OF is set, otherwise to NULL. Same does ACPI_PTR with
> > > CONFIG_ACPI. That's very helpful for drivers that can be used
> > > with or without oftree / acpi.
> > >
> > > Even though most of the drivers touched here probably don't
> > > actually need that, it's also nice for consistency to make it
> > > the de-facto standard and change all drivers to use the
> > > of_match_ptr() and ACPI_PTR() macros.
> > >
> > > A nice side effect: in some situations, when compiled w/o
> > > CONFIG_OF/CONFIG_ACPI, the corresponding match tables could
> > > automatically become unreferenced and optimized-away by the
> > > compiler, w/o explicitly cluttering the code w/ ifdef's.
> >
> > NAK.
> >
> > It prevents using DT-enabled drivers on ACPI based platforms.
>
> So a system without CONFIG_OF might still make use of .of_match_table?

Yep!

> If so: TIL ...

-- 
With Best Regards,
Andy Shevchenko