Re: [RFC PATCH 1/6] DRIVERS: IRQCHIP: IRQ-GIC: Add support for routableirqs

From: Sricharan R
Date: Mon Sep 30 2013 - 11:01:39 EST

On Monday 30 September 2013 07:52 PM, 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]
Sorry, missed adding that and thanks for pointing it.


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