linux-kernel - Re: [RFC PATCH 1/4] DRIVERS: IRQCHIP: Add crossbar irqchip driver

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Date:	Wed, 18 Sep 2013 19:22:16 +0530
From:	Sricharan R <r.sricharan@...com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	Rajendra Nayak <rnayak@...com>
Subject: Re: [RFC PATCH 1/4] DRIVERS: IRQCHIP: Add crossbar irqchip driver

Hi Thomas,

On Tuesday 17 September 2013 05:56 PM, Linus Walleij wrote:
> On Fri, Sep 13, 2013 at 4:24 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>
>> So why can't you make use of irq domains and have the whole routing
>> business implemented sanely?
>>
>> What's needed is in gic_init_bases():
>> irq
>>        if (of_property_read(node, "routable_irqs", &nr_routable_irqs) {
>>           irq_domain_add_legacy(nr_gic_irqs);
>>        } else {
>>           irq_domain_add_legacy(nr_per_cpu_irqs);
>>           irq_domain_add_linear(nr_routable_irqs);
>>        }
>>
>> Now that separate domain has an xlate function which grabs a free GIC
>> irq from a bitmap and returns the hardware irq number in the gic
>> space. The map/unmap callbacks take care of setting up / tearing down
>> the route in the crossbar.
> This is obviously the right approach, it's exactly what .map should do
> the only special thing here being that we have hardware to perform
> the mapping ... bah why didn't I realize this :-(
>
> Yours,
> Linus Walleij
Thanks for the suggestion.

So as i understand this, this implies using the GIC domain itself and
 add the support for dynamically routable irqs (like crossbar) with in the
GIC driver itself right ?

Regards,
 Sricharan
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