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

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Date:	Fri, 10 Aug 2012 17:11:56 +0800
From:	Wei Ni <wni@...dia.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"brcm80211-dev-list@...adcom.com" <brcm80211-dev-list@...adcom.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"frankyl@...adcom.com" <frankyl@...adcom.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: How to get the irq flags from the dts file

On Thu, 2012-08-09 at 20:05 +0800, Mark Brown wrote:
> 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.

I tried it, it worked fine. thanks for your help.

> 
> > 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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