linux-kernel - Re: [RFC PATCH 1/6] DRIVERS: IRQCHIP: IRQ-GIC: Add support for routable irqs

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Message-ID: <52498A94.7090009@arm.com>
Date:	Mon, 30 Sep 2013 15:28:36 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
CC:	Sricharan R <r.sricharan@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"tony@...mide.com" <tony@...mide.com>,
	"rnayak@...com" <rnayak@...com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Mark Rutland <Mark.Rutland@....com>
Subject: Re: [RFC PATCH 1/6] DRIVERS: IRQCHIP: IRQ-GIC: Add support for routable
 irqs

On 30/09/13 15:22, Santosh Shilimkar wrote:
> On Monday 30 September 2013 10:16 AM, Marc Zyngier wrote:
>> On 30/09/13 14:59, Sricharan R wrote:
>>> In some socs the gic can be preceded by a crossbar IP which
>>> routes the peripheral interrupts to the gic inputs. The peripheral
>>> interrupts are associated with a fixed crossbar input line and the
>>> crossbar routes that to one of the free gic input line.
>>>
>>> The DT entries for peripherals provides the fixed crossbar input line
>>> as its interrupt number and the mapping code should associate this with
>>> a free gic input line. This patch adds the support inside the gic irqchip
>>> to handle such routable irqs. The routable irqs are registered in a linear
>>> domain. The registered routable domain's callback should be implemented
>>> to get a free irq and to configure the IP to route it.
>>
>> Isn't this just another chained interrupt controller? How is it GIC
>> specific?
>>
> No it isn't a irq controller rather a event router. Patch is missing
> reference to the previous discussion. Previous discussion is here [1]
> 
> Regards,
> Santosh
> 
> [1] https://lkml.org/lkml/2013/9/13/413

Right. I need to go and understand that bit first.

Thanks Santosh.

	M.
-- 
Jazz is not dead. It just smells funny...

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