linux-kernel - Re: [PATCH v2 02/10] irqchip: add irqchip driver for nuc900

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Date:	Tue, 12 Jul 2016 10:26:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Wan Zongshun <vw@...mu.org>, devicetree@...r.kernel.org,
	jason@...edaemon.net, Wan Zongshun <mcuos.com@...il.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>,
	p.zabel@...gutronix.de, Thomas Gleixner <tglx@...utronix.de>,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 02/10] irqchip: add irqchip driver for nuc900

On Tuesday, July 12, 2016 3:04:42 PM CEST Wan Zongshun wrote:
> >
> > Ideally, this should just go away once we use SPARSE_IRQ.
> 
> This platform also can use SPARSE_IRQ? this just a simple irq map and no 
> more irq number in this Soc.
> 

SPARSE_IRQ is implied by ARCH_MULTIPLATFORM, so we will have to
use it once that gets enabled.

Your new irqchip driver already handles IRQ domains, so it will
work out of the box with SPARSE_IRQ, but you have to change the
reference to "NR_IRQS" into something else.

I've prototyped a patch series to enable ARCH_MULTIPLATFORM,
I hope you can start working from what I have and get it to run.

	Arnd