linux-kernel - Re: [PATCH 1/1] PINCTRL: Warn if direct IRQ GPIO set to output

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Date:	Mon, 2 Jun 2014 22:14:16 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	eric ernst <eric.ernst@...ux.intel.com>
Cc:	linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
	mark.gross@...el.com
Subject: Re: [PATCH 1/1] PINCTRL: Warn if direct IRQ GPIO set to output

On Mon, Jun 02, 2014 at 10:13:22PM +0300, Mika Westerberg wrote:
> On Mon, Jun 02, 2014 at 11:35:16AM -0700, eric ernst wrote:
> > On 14-05-30 01:48 AM, Mika Westerberg wrote:
> > >On Tue, May 27, 2014 at 12:26:44PM -0700, eric.ernst@...ux.intel.com wrote:
> > >>From: Eric Ernst <eric.ernst@...ux.intel.com>
> > >>
> > >>For Baytrail, you should never set a GPIO set to direct_irq
> > >>to output mode.  When direct_irq_en is set for a GPIO, it is
> > >>tied directly to an APIC internally, and making the pad output
> > >>does not make any sense. Assert a WARN() in the event this happens.
> > >Can't we just clear that flag when the GPIO is requested? Or is this
> > >something which can't be done at this point?
> > The IRQ setting for that register (the IRQ wiring via direct_irq_en) should
> > be set statically on boot, and should not be changed, let alone allowing for
> > multiple changes during runtime.
> 
> OK.
> 
> Please then follow the coding conventions documented in
> Documentation/SubmittingPatches and also check that

Documentation/CodingStyle, that is.

> scripts/checkpatch.pl doesn't complain too much.
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