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

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Message-ID: <4E43F5F8.4060704@gmail.com>
Date:	Thu, 11 Aug 2011 10:32:08 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Will Deacon <will.deacon@....com>
CC:	Arnd Bergmann <arnd@...db.de>, 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 08/11/2011 08:09 AM, Will Deacon wrote:
> 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.
> 

I know of one. Although, we have the combined interrupt as well. The
binding should allow either way and specify the order. If the event
counter interrupt is 1st, then it should be the same to s/w.

Rob

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