linux-kernel - Re: Subject: L2x0 OF properties do not include interrupt #

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Message-ID: <20110811130910.GA10189@e102144-lin.cambridge.arm.com>
Date:	Thu, 11 Aug 2011 14:09:10 +0100
From:	Will Deacon <will.deacon@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Rob Herring <robherring2@...il.com>,
	Mark Rutland <Mark.Rutland@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"weizeng.he@....com" <weizeng.he@....com>,
	"workgroup.linux@....com" <workgroup.linux@....com>,
	"'Barry Song'" <21cnbao@...il.com>,
	"'Grant Likely'" <grant.likely@...retlab.ca>,
	"'Olof Johansson'" <olof@...om.net>
Subject: Re: Subject: L2x0 OF properties do not include interrupt #

On Thu, Aug 11, 2011 at 02:05:11PM +0100, Arnd Bergmann wrote:
> On Wednesday 10 August 2011, Will Deacon wrote:
> > I was hoping that it was possible to have separate properties which describe
> > the interrupt. So you could have something like pmu-interrupt <75> and
> > abort-interrupt <76> rather than interrupts <75, 76>.
> 
> Ok, I see.
> 
> > I've not played with DT bindings before though, so if it's usually done with
> > an ordered list then so be it!
> 
> A lot of the code assumes that the property is called 'interrupts' and that
> it contains a fixed-length array of interrupt numbers, each for one specific
> purpose.

Ok, I wondered if something like that might be the case.

> Given that we have so many different meanings for the interrupts, I'm
> not sure how this would work best in this case. According to
> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0246f/CHDFHCFJ.html
> this looks like a nested interrupt controller, i.e. the L2CC has its own mask
> and status register with bits for each one of them. We could model these by
> describing the l2cc interrupt controller with these registers and listing all
> nine of the current inputs. I suspect however that it would be easier to just
> assume that there is only one line for now, and treat the l2cc as a single
> interrupt source with an internal status register.

Given that this binding is only for the l2x0 / pl310 and I don't know of any
implementation where > 1 interrupt line is wired up, I'm happy to assume a
single combined interrupt line for now.

Cheers,

Will
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