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

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Date:	Mon, 02 Jun 2014 11:35:16 -0700
From:	eric ernst <eric.ernst@...ux.intel.com>
To:	Mika Westerberg <mika.westerberg@...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 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.

Eric
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