Re: [Qemu-devel] [PATCH v1 0/4] Connect the Xilinx ZynqMP IPI device

[Peter Maydell]

On 11 July 2016 at 22:56, Alistair Francis <address@hidden> wrote:
> I still think this is helpful as there are a large number of cases
> where setting a bit in a register propagates through the system to
> somewhere else. We use this functionality to control the VINITI pin
> for the R5 in our tree and many other use cases where it is very
> helpful to directly map a bit to the GPIO line.

Well, there are some devices like that. But I think:
 * most devices aren't like that
 * most GPIO lines are more complicated than "just follows
   a register bit"
 * most devices that do have GPIO lines don't have very
   many and it's not very complicated to just implement
   them by open coding them
 * a special case facility that only gets used for the
   rare situation is going to make those devices harder
   to understand and maintain because they do things in
   a different way to everything else

> Is there any chance I can convince you that this is useful and
> get it merged?

It doesn't seem very likely, I'm afraid.

thanks
-- PMM