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

From: [email-masked] (Marc Zyngier)
Date: Mon, 30 Sep 2013 15:28:36 +0100

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.
-- 
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