linux-kernel - Re: [PATCH 06/24] C6X: devicetree

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Date:	Tue, 13 Sep 2011 08:39:04 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	devicetree-discuss@...ts.ozlabs.org,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/24] C6X: devicetree

On Tue, 2011-09-13 at 08:43 +0200, Arnd Bergmann wrote:
> 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.
> 

It is a core register area. Similar to ARM or MIPS coprocessor
registers.

--Mark


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