From: Tabi Timur-B04825 <B04825@freescale.com>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
Felix Radensky <felix@embedded-sol.com>
Subject: Re: Handling multiple GPIO controllers in 8xxx GPIO driver
Date: Thu, 29 Sep 2011 20:22:06 +0000 [thread overview]
Message-ID: <4E84D36D.3050200@freescale.com> (raw)
In-Reply-To: <20110929172737.GF6800@ponder.secretlab.ca>
Grant Likely wrote:
> A chained handler has an expedited path through the interrupt code for
> handling it (basically, it skips handling it at the parent controller
> and passes through to the child, but it cannot handle multiple chained
> children on a single irq input.
So you can't do a shared chained handler? If the chained handler returns=20
IRQ_NONE, the interrupt code just gives up?
Why is it called a "chained" handler? Where's the chain?
I'm trying to understand the core interrupt code, and I can't seem to find=
=20
any descriptions of it.
--=20
Timur Tabi
Linux kernel developer at Freescale=
next prev parent reply other threads:[~2011-09-29 20:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-27 13:59 Handling multiple GPIO controllers in 8xxx GPIO driver Felix Radensky
2011-09-27 18:29 ` Grant Likely
2011-09-27 22:07 ` Felix Radensky
2011-09-28 20:52 ` Tabi Timur-B04825
2011-09-29 17:27 ` Grant Likely
2011-09-29 20:22 ` Tabi Timur-B04825 [this message]
2011-09-29 21:36 ` Grant Likely
2011-09-29 20:44 ` Felix Radensky
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