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

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Message-Id: <201208091148.42748.arnd@arndb.de>
Date:	Thu, 9 Aug 2012 11:48:42 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Wei Ni <wni@...dia.com>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	frankyl@...adcom.com, brcm80211-dev-list@...adcom.com,
	devicetree-discuss@...ts.ozlabs.org,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: How to get the irq flags from the dts file

On Thursday 09 August 2012, Wei Ni wrote:
> In the wlan driver, it will use platform_get_resource() to get the
> res->irq, res->flags, the irq number is right, but the flags will be
> IORESOURCE_IRQ, not the 0x04 (IRQF_TRIGGER_HIGH).
> 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.
> 
> I checked drivers/of/irq.c, in function of_irq_to_resource(), it will
> set r->flags = IORESOURCE_IRQ directly, not read the flags from the dtb
> file. And I didn't find any of_xx api to get this flags.
> 
> How can I get this flags, does anyone has suggestion?

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.

	Arnd
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