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SubjectRe: [PATCH 1/2] PRUSS UIO driver support
Hello.

Hans J. Koch wrote:

>>> -----Original Message-----
>>> From: Hans J. Koch [mailto:hjk@hansjkoch.de]
>>> Sent: Sunday, February 20, 2011 12:04 AM
>>> To: TK, Pratheesh Gangadhar
>>> Cc: Thomas Gleixner; Arnd Bergmann; linux-arm-kernel@lists.infradead.org;
>>> davinci-linux-open-source@linux.davincidsp.com; gregkh@suse.de;
>>> Chatterjee, Amit; Hans J. Koch; LKML
>>> Subject: Re: [PATCH 1/2] PRUSS UIO driver support

>>> On Sat, Feb 19, 2011 at 09:10:23PM +0530, TK, Pratheesh Gangadhar wrote:
>>>> For my understanding - if the interrupt is not shared and not level triggered -
>>>> is this okay to have empty handler?

>>> Greg already said he won't accept that. And I'm quite sure these
>>> interrupts
>>> are level triggered, since that is the default on arch/omap.

>>> E.g. in arch/arm/mach-omap1/irq.c, a loop sets all irqs to level triggered
>>> handling: set_irq_handler(j, handle_level_irq); (line 234)

>> You should be looking at arch/arm/mach-davinci/irq.c

Into arch/arm/mach-davinci/cp_intc.c actually as we're not talking about a
"real" DaVincis here, but about OMAP-L138.

> Hmpf. I alway get lost in the directory structure of TI SoCs...
> At least I learned that OMAP3 is in the omap2 directory :)

It's probably even more convoluted with DaVinci and friends. :-)

>> and all interrupts except IRQ_TINT1_TINT34 is set to edge trigger mode (line 160).

> Is that really needed? Level triggered interrupts should certainly be
> preferred if possible.

Don't look there, this code is for "real" DaVincis only.

> Thanks,
> Hans

WBR, Sergei


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