From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mika Westerberg <mika.westerberg@linux.intel.com>
Subject: Re: [PATCH] pinctrl: intel: Turn Baytrail support to tristate
Date: Tue, 16 Feb 2016 10:53:46 +0200
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To: Linus Walleij <linus.walleij@linaro.org>
Cc: Jean Delvare <jdelvare@suse.de>, "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Mathias Nyman <mathias.nyman@intel.com>

On Tue, Feb 16, 2016 at 12:13:36AM +0100, Linus Walleij wrote:
> On Thu, Feb 11, 2016 at 12:23 PM, Mika Westerberg
> <mika.westerberg@linux.intel.com> wrote:
> > On Thu, Feb 11, 2016 at 12:05:51PM +0100, Jean Delvare wrote:
> >> The pinctrl-baytrail driver builds just fine as a module so give
> >> users this option.
> >
> > IIRC the reason why this is built-in is that there are all kind of ACPI
> > GPIO magic happening behind the scenes on Baytrail-T based machines
> > (such as Asus T100) and it does not work without the GPIO driver. Some
> > of the stuff is done pretty early too.
> 
> Hm I wonder if that could be the case for the AMD driver that just
> got tristated too...

If they use ACPI GPIO events and operation regions early at boot then it
can be the case.