From: Michael Ellerman <michael@ellerman.id.au>
To: yamazaki seiji <yamazaki.seiji@kk.jp.panasonic.com>
Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>
Subject: Re: Interrupt ID number on mpc8347
Date: Fri, 03 Apr 2009 21:57:59 +1100 [thread overview]
Message-ID: <1238756279.9595.15.camel@localhost> (raw)
In-Reply-To: <20090403163928.4679.YAMAZAKI.SEIJI@kk.jp.panasonic.com>
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On Fri, 2009-04-03 at 16:51 +0900, yamazaki seiji wrote:
> I set the Interrupt ID number 17.
> But kernel gives the Interrupt ID number 19.
>
> I wont to know the reasen.
> Please tell me.
It's because the irqs are remapped by the kernel, the number in the
device tree is a hardware irq number. The number you're printing out is
a virtual irq number.
of_irq_to_resource() is doing the remapping for you.
You can turn on CONFIG_VIRQ_DEBUG and you'll get a file in debugfs that
shows the mapping between hardware numbers and virtual numbers.
cheers
--
Michael Ellerman
OzLabs, IBM Australia Development Lab
wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)
We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person
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next prev parent reply other threads:[~2009-04-03 10:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-03 7:51 Interrupt ID number on mpc8347 yamazaki seiji
2009-04-03 10:57 ` Michael Ellerman [this message]
2009-04-03 15:00 ` Liu Dave-R63238
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