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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Mon, Sep 30, 2013 at 4:16 PM, Marc Zyngier <marc.zyngier@xxxxxxx> 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?

I thought so from the beginning but I was dead wrong, as pointed out
by tglx it is basically a hardware .map function, so its usecase will map
to the irqdomain .map/.unmap so to say.

Yours,
Linus Walleij
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux