On May 9, 2007, at 2:46 PM, Robert Swindells wrote:

>
> Tim Rightnour wrote:
>> This is a quick update of the branch status, as well as the  
>> results from the
>> hackathon.
>
>> 1) extr_intr unification.  Mostly done.  Prep and macppc have been
>> converted to the new shared pic code.  Generic handlers have been
>> written for i8259, prepivr, and openpic.  Still remaining is
>> conversion of other ports.
>
> [snip]
>
>> Even though the hackathon is officially over, the branch is still
>> open, and work continues.  Now that macppc and prep are mostly
>> converted, these can serve as examples to anyone wanting to try to
>> take on a port.
>
> How is the new interrupt code designed to be used on systems that have
> interrupt enables and masks split over multiple registers ?
>
> There is an example in powerpc/marvell.

I'm converting marvell.  You can make then independent or cascade them.
For instance, I'm cascading the GPIOs off the main marvell interrupt  
register
which I'm treating as one 64bit register.