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

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Message-ID: <20111205202125.GA32592@oksana.dev.rtsoft.ru>
Date:	Tue, 6 Dec 2011 00:21:25 +0400
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Dave Martin <dave.martin@...aro.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	devicetree-discuss@...ts.ozlabs.org,
	LKML <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jgarzik@...hat.com>, linux-ide@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	linux-next@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jonas Bonn <jonas@...thpole.se>,
	Michal Simek <monstr@...str.eu>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH] ata: Don't use NO_IRQ in pata_of_platform driver

On Mon, Dec 05, 2011 at 01:16:39PM -0600, Rob Herring wrote:
[...]
> At least for DT enabled platforms, we could force "no irq" to be 0 in
> the DT irq code. Searching the dts files, I found 2 occurrences of IRQ0.

Please note that there are HW IRQ numbers and "Virtual" IRQ numbers.
dev->irq and thus the thing that we pass into request_irq() is a
virtual IRQ thing, a "cookie".

While in device tree you see real HW IRQ numbers.

Legal VIRQ is always > 0, while HW IRQ could be >= 0.

> Prima2 has timer on IRQ0, and VersatileAB has watchdog on IRQ0. Prima2
> should be fine currently as it doesn't use the of_irq_* functions to get
> the timer irq, but that is an issue as it skips any translation.
> VersatileAB should be okay with the VIC irqdomain support.

It shouldn't be an issue to use of_irq_*() functions for these IRQs.
of_irq_*() will remap HW IRQ 0 to some other VIRQ. If it does not do
this currently, then it's a bug and should be fixed.

Thanks,

-- 
Anton Vorontsov
Email: cbouatmailru@...il.com
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