linux-kernel - Re: [PATCH v5 09/15] i2c: acpi: Introduce i2c_acpi_get_i2c

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Date:   Fri, 30 Nov 2018 13:45:43 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-acpi@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 09/15] i2c: acpi: Introduce
 i2c_acpi_get_i2c_resource() helper

On Fri, Nov 30, 2018 at 12:06:52PM +0100, Wolfram Sang wrote:
> > > >  drivers/i2c/i2c-core-acpi.c | 41 ++++++++++++++++++++++++++-----------
> > > >  include/linux/acpi.h        | 11 ++++++++++
> > > 
> > > Any reason this is not in i2c.h?
> > 
> > Yes. As I explained earlier to some people there are facts affecting this:
> > - the function is operate on top of solely ACPI structures
> 
> And moving the function itself to the ACPI realm then?

Unfortunately I don't see the place where it fits good. See below.

> I don't say this is a show-stopper for this series, but I just wonder...
> 
> > - there is already similar function for GPIO and it stays like that
> > 
> > On top of this recently I've discovered, that i2c.h has separate #ifdef for I2C
> > and ACPI which theoretically might produce a linker error in some cases.
> 
> Is this something we have to live with or which can be cleaned up
> somewhen?

My opinion that we might need something like
drivers/acpi/acpi_i2c_lib.c
drivers/acpi/acpi_gpio_lib.c
etc.

But better to ask Rafael and Mika what they think about this.

-- 
With Best Regards,
Andy Shevchenko