linux-kernel - Re: How to get the irq flags from the dts file

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Message-ID: <20120809120530.GC8474@sirena.org.uk>
Date:	Thu, 9 Aug 2012 13:05:30 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, Wei Ni <wni@...dia.com>,
	linux-wireless@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org,
	brcm80211-dev-list@...adcom.com, linux-kernel@...r.kernel.org,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	frankyl@...adcom.com, linux-tegra@...r.kernel.org
Subject: Re: How to get the irq flags from the dts file

On Thu, Aug 09, 2012 at 11:48:42AM +0000, Arnd Bergmann wrote:
> On Thursday 09 August 2012, Wei Ni wrote:

> > The wlan driver wish this flags include the IRQF_TRGGER_* information,
> > and it will use this flags to configure other hw settings. If it is
> > wrong, the wlan can't work.

You can read the configuration with irqd_get_trigger_type() - see the OF
code in sound/soc/codecs/wm8903.c for an example.

> The driver should not need to know about thie flag. It gets read
> by irq_create_of_mapping when calling teh xlate function and
> gets set using irq_set_irq_type from there too.

That only helps the interrupt controller, it doesn't help the interrupt
source.  A good proportion of embedded devices have a great deal of
flexibility in how they signal interrupts so they need to know what mode
to pick.
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