From: Pavel Machek <pavel@ucw.cz>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Trilok Soni <soni.trilok@gmail.com>,
Brian Swetland <swetland@google.com>,
Joonyoung Shim <jy0922.shim@samsung.com>,
m.szyprowski@samsung.com, t.fujak@samsung.com,
kyungmin.park@samsung.com, David Brownell <david-b@pacbell.net>,
Daniel Ribeiro <drwyrm@gmail.com>,
arve@android.com, Barry Song <21cnbao@gmail.com>
Subject: Re: [RFC patch 2/3] genirq: Add buslock support for irq chips on slow busses
Date: Fri, 14 Aug 2009 12:30:13 +0200 [thread overview]
Message-ID: <20090814103013.GC32418@elf.ucw.cz> (raw)
In-Reply-To: <alpine.LFD.2.00.0908141220190.1283@localhost.localdomain>
On Fri 2009-08-14 12:20:49, Thomas Gleixner wrote:
> On Fri, 14 Aug 2009, Pavel Machek wrote:
> > > +extern void disable_slowbus_irq(unsigned int irq);
> > > +extern void enable_slowbus_irq(unsigned int irq);
> > > +
> >
> > AFAICT this means that driver would need to know what kind of IRQ it
> > is hooked to, right? That will lead to some ugly code in drivers that
> > can handle both normal and slowbus irqs, right?
>
> Are there such drivers in reality ?
I think so. Between Spitz and Akita, some gpios were moved to slow i2c
extender. For stuff like buttons...
Now... it is probably already fixed somehow for Spitz/Akita, but I
believe more hardware designers do such things....
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-08-14 10:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-13 19:40 [RFC patch 0/3] Support for irq chips on slow busses (i2c, spi) Thomas Gleixner
2009-08-13 19:40 ` [RFC patch 1/3] genirq: Add oneshot support Thomas Gleixner
2009-08-13 19:40 ` [RFC patch 2/3] genirq: Add buslock support for irq chips on slow busses Thomas Gleixner
2009-08-14 8:50 ` Peter Zijlstra
2009-08-14 9:03 ` Thomas Gleixner
2009-08-14 9:18 ` Ingo Molnar
2009-08-14 9:29 ` Peter Zijlstra
2009-08-14 9:59 ` Thomas Gleixner
2009-08-14 10:17 ` Pavel Machek
2009-08-14 10:20 ` Thomas Gleixner
2009-08-14 10:30 ` Pavel Machek [this message]
2009-08-14 11:20 ` Mark Brown
2009-08-15 9:55 ` Ingo Molnar
2009-08-15 11:37 ` Thomas Gleixner
2009-08-15 14:29 ` Ingo Molnar
2009-08-13 19:40 ` [RFC patch 3/3] genirq: Support nested threaded irq handling Thomas Gleixner
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