[PATCH 3/8] Add a mfd IPUv3 driver

Arnd Bergmann arnd at arndb.de
Tue Mar 1 06:43:33 EST 2011

On Tuesday 01 March 2011, Sascha Hauer wrote:
> > Taking one step back from this, have you considered making this
> > a regular interrupt controller? That would make the client drivers
> > more standard -- you could define the interrupt numbers as resources
> > of a platform device or in the device tree, for instance.
> > The cost might be more complex code, e.g. when a device requires
> > many interrupts, but I think it will be at least as efficient
> > at run-time, and less surprising for readers and authors of
> > client drivers.
> I thought about this, but hesitated to increase NR_IRQS by 463. Do you
> think we should do this instead?

I think there is a plan to virtualize the interrupt numbers on ARM,
and in that case NR_IRQS becomes rather meaningless. I don't know
exactly how far that effort has come.


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