linux-kernel - Re: [RFC patch 2/3] genirq: Add buslock support for irq chips on slow busses

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Message-ID: <20090814103013.GC32418@elf.ucw.cz>
Date:	Fri, 14 Aug 2009 12:30:13 +0200
From:	Pavel Machek <pavel@....cz>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Trilok Soni <soni.trilok@...il.com>,
	Brian Swetland <swetland@...gle.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	m.szyprowski@...sung.com, t.fujak@...sung.com,
	kyungmin.park@...sung.com, David Brownell <david-b@...bell.net>,
	Daniel Ribeiro <drwyrm@...il.com>, arve@...roid.com,
	Barry Song <21cnbao@...il.com>
Subject: Re: [RFC patch 2/3] genirq: Add buslock support for irq chips on
	slow busses

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
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