linux-kernel - Re: [PATCH v3 2/3] mfd: lubbock_io: add lubbock

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Message-ID: <20150121130231.GQ26493@n2100.arm.linux.org.uk>
Date:	Wed, 21 Jan 2015 13:02:31 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	linux-kernel@...r.kernel.org,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Kumar Gala <galak@...eaurora.org>,
	Daniel Mack <daniel@...que.org>
Subject: Re: [PATCH v3 2/3] mfd: lubbock_io: add lubbock_io board

On Wed, Jan 21, 2015 at 12:35:51PM +0000, Lee Jones wrote:
> I think to set an edge trigger on an IRQ, you should instead do so via
> irq_set_irq_type(), or have a missed a line or two?

Setting the IRQ type in request_irq() is perfectly acceptable.

include/linux/interrupt.h:
/*
 * These correspond to the IORESOURCE_IRQ_* defines in
 * linux/ioport.h to select the interrupt line behaviour.  When
 * requesting an interrupt without specifying a IRQF_TRIGGER, the
 * setting should be assumed to be "as already configured", which
 * may be as per machine or firmware initialisation.
 */
#define IRQF_TRIGGER_NONE       0x00000000
#define IRQF_TRIGGER_RISING     0x00000001
#define IRQF_TRIGGER_FALLING    0x00000002
#define IRQF_TRIGGER_HIGH       0x00000004
#define IRQF_TRIGGER_LOW        0x00000008

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