linux-kernel - Re: How to create IRQ mappings in a GPIO driver that doesn't control its IRQ domain ?

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Date:	Thu, 25 Jul 2013 15:19:32 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Likely <grant.likely@...aro.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: How to create IRQ mappings in a GPIO driver that doesn't control
 its IRQ domain ?

On Thu, Jul 25, 2013 at 11:45 AM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:

> The two devices are independent, so there's no real parent/child relationship.
> However, as Grant proposed, I could list all the interrupts associated with
> GPIOs in the GPIO controller DT node. I would then just call
> irq_of_parse_and_map() in the .to_irq() handler to magically translate the
> GPIO number to a mapped IRQ number.

That works even if the device tree will need a comment or two
to explain what is going on.

I suggested a similar solution for the OMAP crossbar mux
that is discussed in another thread, so I'm happy with this
approach.

Yours,
Linus Walleij
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