linux-kernel - Re: [PATCH] ata: Don't use NO_IRQ in pata_of

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Message-ID: <4EDE7350.4010104@gmail.com>
Date:	Tue, 06 Dec 2011 13:56:00 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Dave Martin <dave.martin@...aro.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Pawel Moll <pawel.moll@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	devicetree-discuss@...ts.ozlabs.org, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	linux-next@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Anton Vorontsov <cbouatmailru@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeff Garzik <jgarzik@...hat.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ata: Don't use NO_IRQ in pata_of_platform driver

On 12/06/2011 05:49 AM, Russell King - ARM Linux wrote:
> On Tue, Dec 06, 2011 at 11:37:35AM +0000, Dave Martin wrote:
>> 1) All OF code and drivers should be migrating to use 0 instead of NO_IRQ
>>    for the no-interrupt case.  Code which receives irq numbers directly
>>    from the OF framework and refers to NO_IRQ, or expects 0 to be a valid
>>    needs to be fixed.
>>
>> 2) Where we hit a problem, board code needs to be adapted to remap HW IRQs
>>    0-15 to different software values.  (This could be done using irq
>>    domains, or not)
> 
> No AMBA driver I'm aware of ever uses an IRQ number 0 or is passed such
> an IRQ number.

The watchdog on VersatileAB is on Linux IRQ0. This is easily fixed with
VIC irqdomain patches which are queued up.

Rob
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