linux-kernel - [PATCH 0/2] ACPI: Simplify "glueing" to physical nodes (was: Re: [PATCH v2 3/3 UPDATED] i2c / ACPI: add ACPI enumeration support)

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Message-ID: <1758879.PKgPhTGcB7@vostro.rjw.lan>
Date:	Sun, 18 Nov 2012 22:10:33 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jean Delvare <khali@...ux-fr.org>, ben-linux@...ff.org,
	w.sang@...gutronix.de, linux-kernel@...r.kernel.org,
	lenb@...nel.org, rafael.j.wysocki@...el.com,
	broonie@...nsource.wolfsonmicro.com, grant.likely@...retlab.ca,
	linus.walleij@...aro.org, mathias.nyman@...ux.intel.com,
	linux-acpi@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 0/2] ACPI: Simplify "glueing" to physical nodes (was: Re: [PATCH v2 3/3 UPDATED] i2c / ACPI: add ACPI enumeration support)

On Sunday, November 18, 2012 05:55:39 PM Mika Westerberg wrote:
> On Sat, Nov 17, 2012 at 12:24:45PM +0100, Rafael J. Wysocki wrote:
> > Well, maybe there is one.  Perhaps we can make acpi_platform_notify() 
> > call acpi_bind_one() upfront and only if that fails, do the whole
> > type->find_device() dance?  Of course, acpi_bind_one() would need to
> > be modified slightly too, like in the patch below.
> > 
> > If we did that, acpi_i2c_add_device() would only need to assign acpi_handle
> > as appropriate before calling i2c_new_device() (and analogously for SPI).
> > 
> > What do you think? 
> 
> This is certainly better than the thing we use currently. It makes adding
> I2C and SPI support much shorter and simpler. If others don't object I
> would suggest that we switch to use this method.

OK, thanks.

The first of the following two patches is a slightly modified version of the
one that you commented.  Patch [2/2] implements the idea for platform devices
and since it modifies struct platform_device_info, I'm adding a CC to Greg.

The patches are on top of current linux-pm.git/linux-next.

It looks like we may be able to use this approach for PCI too, in which case
the whole .find_device() stuff won't be necessary any more.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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