linux-kernel - Re: [PATCH v3] mfd: ADP5520 Multifunction LCD Backlight and KeypadInput Device Driver

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Date:	Tue, 6 Oct 2009 14:58:37 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Hennerich, Michael" <Michael.Hennerich@...log.com>
Cc:	Mike Frysinger <vapier@...too.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org, Bryan Wu <cooloney@...nel.org>
Subject: Re: [PATCH v3] mfd: ADP5520 Multifunction LCD Backlight and
 KeypadInput Device Driver

On Tue, Oct 06, 2009 at 01:55:45PM +0100, Hennerich, Michael wrote:
> >From: Mark Brown [mailto:broonie@...nsource.wolfsonmicro.com]

> >I'm not sure what the association with virtual gpios is?  This is all
> >separate to gpiolib except in that it would mean that a gpio driver for
> >the device would be able to export these interrupts to its clients.

> This is what I meant.
> So you propose having the MFD Core as well as its subdevs requesting the
> ADP5520 IRQ (client->irq) IRQF_SHARED? I think we already excluded us
> from using this option when we were asked to move to the NEW threaded
> irqs?

No, I'm suggesting implementing an IRQ controller driver for the device
- register an irq_chip for the interrupt controller on it.  Support for
doing this on I2C devices was added at pretty much the same time as the
IRQ_ONESHOT support.  This gives access to all the genirq infrastrure
features rather than having to implement a custom IRQ handling stack.

Like I say, I'm not sure what you meant when you were talking about
virtual gpios.
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