linux-kernel - Re: [PATCH] pinctrl: baytrail: show output gpio state correctly on Intel Baytrail

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Date:	Mon, 3 Nov 2014 09:00:48 -0600
From:	Felipe Balbi <balbi@...com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	David Cohen <david.a.cohen@...ux.intel.com>,
	Felipe Balbi <balbi@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	stable <stable@...r.kernel.org>, <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH] pinctrl: baytrail: show output gpio state correctly on
 Intel Baytrail

On Mon, Nov 03, 2014 at 11:24:02AM +0200, Mika Westerberg wrote:
> On Fri, Oct 31, 2014 at 11:45:09AM -0700, David Cohen wrote:
> > > I think adding the module exit + allowing this driver to be a module
> > > would be a good approach. Then we don't need to force generic x86 kernel
> > > binaries to always have this driver. Unless Mathias or Mika knows a
> > > constraint to force this driver to be builtin only.
> > 
> > It helps if I CC them when asking for feedback :)
> > 
> > Mathias, Mika, do you know any constraint that forces pinctrl-baytrail
> > to be bool?
> 
> The only constraint that has been keeping this driver as bool is that
> some machines like, Asus T100, uses ACPI GPIO operation regions for
> toggling GPIOs to get things like sensor hub powered on. The GPIO
> operation region code does not yet handle -EPROBE_DEFER so only way to
> ensure that the operation region is there is to have the driver compiled
> in to the kernel.

But that's not enough excuse to have every single x86 in the market
shipping with this driver. Think about a distro kernel, most likely this
gets enabled and it's wrong in 80% of the cases.

It would be nicer to add EPROBE_DEFER support, convert this into
tristate and have default = M if BAYTRAIL, or something.

-- 
balbi

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