From: Scott Wood <scottwood@freescale.com>
To: "Hans J. Koch" <hjk@hansjkoch.de>
Cc: Grant Likely <grant.likely@secretlab.ca>,
devicetree-discuss@lists.ozlabs.org,
linux-kernel@vger.kernel.org, john.williams@petalogix.com
Subject: Re: [PATCH v3] uio/pdrv_genirq: Add OF support
Date: Tue, 19 Apr 2011 18:09:19 -0500 [thread overview]
Message-ID: <20110419180919.17971598@schlenkerla.am.freescale.net> (raw)
In-Reply-To: <20110419220018.GB2772@local>
On Wed, 20 Apr 2011 00:00:18 +0200
"Hans J. Koch" <hjk@hansjkoch.de> wrote:
> On Tue, Apr 19, 2011 at 12:08:16AM -0600, Grant Likely wrote:
> > PowerPC and x86 will return 0 for an unassigned IRQ, as will most platforms.
>
> That might be right for these architectures. On ARM SoCs, IRQ0 is often a
> normal irq like any other (e.g. "Audio DMA Controller 1" on Telechips TCC8000).
It's true on at least some powerpc and x86 interrupt controllers as well.
ARM isn't special. :-)
I'm not sure what goes on on x86, as I see a real " 0:" in
/proc/interrupts. But on powerpc, Linux's IRQ numberspace is decoupled
from that of any IRQ controller. This is mainly to accommodate multiple
IRQ controllers with their own numberspaces in the same system; being able
to avoid irq 0 is just a bonus.
-Scott
next prev parent reply other threads:[~2011-04-19 23:09 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-18 8:50 [PATCH v3] uio/pdrv_genirq: Add OF support Michal Simek
2011-04-18 10:35 ` Paul Mundt
[not found] ` <20110418103513.GA27864-M7jkjyW5wf5g9hUCZPvPmw@public.gmane.org>
2011-04-18 11:10 ` Michal Simek
[not found] ` <1303116654-5042-1-git-send-email-monstr-pSz03upnqPeHXe+LvDLADg@public.gmane.org>
2011-04-18 16:06 ` Wolfram Sang
[not found] ` <20110418160658.GD23814-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-04-19 1:58 ` John Williams
2011-04-19 6:11 ` Grant Likely
2011-04-19 7:32 ` Arnd Bergmann
[not found] ` <201104190932.31777.arnd-r2nGTMty4D4@public.gmane.org>
2011-04-19 8:42 ` Michal Simek
2011-04-19 12:37 ` John Williams
2011-04-19 13:02 ` Arnd Bergmann
2011-04-19 14:49 ` Grant Likely
2011-04-19 15:07 ` Arnd Bergmann
[not found] ` <201104191707.40456.arnd-r2nGTMty4D4@public.gmane.org>
2011-04-19 15:45 ` Grant Likely
[not found] ` <BANLkTimFnfgiQ5aMq_KwqHP8p92pjOJJwg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-04-21 12:08 ` Wolfram Sang
[not found] ` <20110421120855.GC2135-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-04-21 23:46 ` John Williams
2011-04-22 6:07 ` Wolfram Sang
2011-04-19 8:16 ` Michal Simek
2011-04-19 6:08 ` Grant Likely
2011-04-19 8:15 ` Michal Simek
2011-04-19 22:00 ` Hans J. Koch
2011-04-19 23:09 ` Scott Wood [this message]
2011-04-27 11:05 ` Michal Simek
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