> The work I'm doing here is for stupid PCI firmware engineers, who have
 > created devices that are different things, all bound up under the same
 > PCI device.  I'm thinking of watchdog timers and random number
 > generator and i2c controller on the same PCI device, or even the more
 > basic, frame buffer and DRM access to the same PCI video device.
 > 
 > The OLPC is a good example of hardware that needs this kind of
 > functionality.

Sounds interesting.  I've been meaning to work on this too for quite a
while, but I'm glad to see you beat me to it.

An example of an in-tree use case for this would be the mlx4 drivers--
you can look at drivers/net/mlx4/intf.c to see the simple stupid
solution I came up with to allow an IB and a NIC (not yet upstream)
driver to share the same PCI device.  A good test for your stuff would
be if it simplifies the code from the ad hoc solution I came up with.

 - R.
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