linux-kernel - Re: [PATCH 09/26] mfd: ab8500-debugfs: Provide a means for a user subscribe to IRQs

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Date:	Mon, 28 Jan 2013 11:49:33 +0100
From:	Samuel Ortiz <sameo@...ux.intel.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, linus.walleij@...ricsson.com
Subject: Re: [PATCH 09/26] mfd: ab8500-debugfs: Provide a means for a user
 subscribe to IRQs

Hi Lee,

On Mon, Jan 28, 2013 at 10:22:23AM +0000, Lee Jones wrote:
> On Mon, 28 Jan 2013, Samuel Ortiz wrote:
> 
> > Hi Lee,
> > 
> > On Tue, Jan 15, 2013 at 12:55:49PM +0000, Lee Jones wrote:
> > > Allow users to subscribe to and view IRQ events live from debugfs.
> > I seem to remember that I got a similar patch some time ago for the same
> > purpose and my answer was: Please use a UIO driver for this. There already is
> > such driver, it's uio_pdrv_genirq. What your debugfs registration entry could
> > do is adding a platform device for the specific interrupt number. This would
> > avoid the irq handler registration and the sysfs entry creation, both things I
> > believe are not very elegant and open coded. It also gives you an IRQ count
> > implementation.
> > Ideally, the UIO framework could be improved to support IRQ ranges (through
> > IRQ domains) instead of the current single interrupt number.
> > 
> > Have you considered going through that path ?
> 
> I'm going to have to put this patch-set in the bin. Pulling this
> patch, causes lots of conflicts to the remaining patches in the
> set.
I bet removing this one causes a lot of conflicts. I'm not saying it should
absolutely be removed, but I'm afraid once it's upstream no one is going to
look at improving it. And to be honest, having an IRQ handler from debugfs
code looks weird to me. I know you can put all sort of crazyness into a
debugfs entry, but still.

 
> I'll start again from scratch and find another way to sync the ab* MFD
> drivers. I might even have to do it manually i.e. throw out all
> commit history and upstream it as my own patches pulled in from diffs.
I don't have any problems with that.

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/
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