linux-kernel - Re: [PATCH] gpio-ich: Share ownership of GPIO groups

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Message-ID: <20120911125608.385356fc@endymion.delvare>
Date:	Tue, 11 Sep 2012 12:56:08 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Peter Tyser <ptyser@...-inc.com>,
	Aaron Sierra <asierra@...-inc.com>
Subject: Re: [PATCH] gpio-ich: Share ownership of GPIO groups

On Tue, 11 Sep 2012 12:41:16 +0200, Samuel Ortiz wrote:
> Hi Jean,
> 
> On Mon, Jul 23, 2012 at 05:34:15PM +0200, Jean Delvare wrote:
> > The ICH chips have their GPIO pins organized in 2 or 3 independent
> > groups of 32 GPIO pins. It can happen that the ACPI BIOS wants to make
> > use of pins in one group, preventing the OS to access these. This does
> > not prevent the OS from accessing the other group(s).
> > 
> > This is the case for example on my Asus Z8NA-D6 board. The ACPI BIOS
> > wants to control GPIO 18 (group 1), while I (the OS) need to control
> > GPIO 52 and 53 (group 2) for SMBus multiplexing.
> > 
> > So instead of checking for ACPI resource conflict on the whole I/O
> > range, check on a per-group basis, and consider it a success if at
> > least one of the groups is available for the OS to use.
> > 
> > Signed-off-by: Jean Delvare <khali@...ux-fr.org>
> > Cc: Peter Tyser <ptyser@...-inc.com>
> > Cc: Aaron Sierra <asierra@...-inc.com>
> > Cc: Grant Likely <grant.likely@...retlab.ca>
> > Cc: Samuel Ortiz <sameo@...ux.intel.com>
> > ---
> > That's probably not the nicest code you've seen, but everything else I
> > could think of either couldn't work or was looking worse. If anyone can
> > think of a better approach, I'm all ears.
> > 
> >  drivers/gpio/gpio-ich.c     |   79 +++++++++++++++++++++++++++++++++++++------
> >  drivers/mfd/lpc_ich.c       |   29 ++++++++++++++-
> >  include/linux/mfd/lpc_ich.h |    1 
> >  3 files changed, 97 insertions(+), 12 deletions(-)
> Applied (finally) to my for-next branch, thanks.

Excellent, thank you!

-- 
Jean Delvare
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