From: Arnd Bergmann <arnd@arndb.de>
To: devicetree-discuss@lists.ozlabs.org
Cc: Mark Salter <msalter@redhat.com>,
Grant Likely <grant.likely@secretlab.ca>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 06/24] C6X: devicetree
Date: Tue, 13 Sep 2011 08:43:56 +0200 [thread overview]
Message-ID: <6360771.ouEC5EKNMR@wuerfel> (raw)
In-Reply-To: <1315869636.11280.26.camel@deneb.redhat.com>
On Monday 12 September 2011 19:20:35 Mark Salter wrote:
> On Mon, 2011-09-12 at 14:11 -0600, Grant Likely wrote:
> > On Wed, Aug 31, 2011 at 05:26:41PM -0400, Mark Salter wrote:
> > > + interrupt-controller;
> > > + #interrupt-cells = <1>;
> > > + compatible = "ti,c64x+core-pic";
> >
> > The interrupt controller isn't addressable? Is it integrated into
> > the CPU?
>
> Yes, that core controller is controlled through registers accessed
> with special-purpose instructions, not MMIO. Other controllers, like
> megamodule and some as-yet unimplemented use MMIO.
Are these instructions specific to the interrupt controller or
do they access a register space that can contain arbitrary
devices?
If there is a separate address space for special devices, it might
be good to describe that in the device tree, like we do for PCI
I/O space.
Arnd
next prev parent reply other threads:[~2011-09-13 6:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1314826019-22330-1-git-send-email-msalter@redhat.com>
[not found] ` <1314826019-22330-1-git-send-email-msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-08-31 21:26 ` [PATCH 06/24] C6X: devicetree Mark Salter
2011-09-12 20:11 ` Grant Likely
[not found] ` <20110912201102.GF23345-e0URQFbLeQY2iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2011-09-12 23:20 ` Mark Salter
2011-09-13 6:43 ` Arnd Bergmann [this message]
2011-09-13 12:39 ` Mark Salter
[not found] ` <1315917546.11280.38.camel-PDpCo7skNiwAicBL8TP8PQ@public.gmane.org>
2011-09-13 15:33 ` Arnd Bergmann
2011-09-13 17:54 ` Grant Likely
[not found] ` <CACxGe6tVafwVN6vdU7sCxL5JM7+as0bp_AaHaGAyE9+eTgR5Tw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-09-13 20:11 ` Arnd Bergmann
2011-09-13 22:26 ` Mark Salter
[not found] <1314043785-2880-1-git-send-email-msalter@redhat.com>
2011-08-22 20:09 ` Mark Salter
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