[RFC v1 01/16] lib: devres: don't enclose pcim_*() functions in CONFIG_HAS_IOPORT

[Alan Cox]

> with it.  It's very simple.  The IO port space is for ISA/PCMCIA and
> PCI IO port regions.  It is nothing more than that.

And on a lot of devices the LPC bus.

> Plus, if you _have_ IO space support, you must have some MMIO region for
> them to target - doing what many platforms have done to date and targetted
> ISA IO address 0 at virtual address 0 is just not on because as soon as
> you build a device driver which probes ISA addresses into your kernel,
> you will oops.

There shouldn't really be anything poking around that is modern - this is
true of some PC stuff too.

In general however if its because you have a window partly mapped you
could just catch the exception and load 0xFF for reads (and probably
whine with a backtrace so you know who to moan at).

Alan