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

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Message-ID: <524987A3.4090204@arm.com>
Date:	Mon, 30 Sep 2013 15:16:03 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Sricharan R <r.sricharan@...com>
CC:	"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>,
	"santosh.shilimkar@...com" <santosh.shilimkar@...com>,
	"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 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?

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

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