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

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Date:	Tue, 13 Sep 2011 18:26:03 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Arnd Bergmann <arnd@...db.de>, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/24] C6X: devicetree

On Tue, 2011-09-13 at 11:54 -0600, Grant Likely wrote:
> On Tue, Sep 13, 2011 at 9:33 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Tuesday 13 September 2011, Mark Salter wrote:
> >> On Tue, 2011-09-13 at 08:43 +0200, Arnd Bergmann wrote:
> >> > 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.
> >
> > I guess it still depends, it's probably a grey area. If the register layout
> > is the same on all c6x cores and it's only for core stuff, there is no need
> > to put it in the device tree. If you have multiple soc (off-core) devices
> > being controlled through the registers, or the numbers vary a lot between
> > different chips, I would put all of them into the device tree.
> 
> It's an interrupt controller.  There still needs to be a node to act
> as the interrupt-parent and specify #interrupt-cells.

It already has that. But maybe that node should be moved into the cpu
node.

--Mark


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