| > I suppose a "pcitag_t *pa_bridgetag" member could be added to pci_attach_args.
| > If non-NULL, it points to the tag for the bridge that is the PCI's parent,
| > and it would obviously be NULL for the root bus.
|
| My dim memory claims Manuel Bouyer wanted something similar some time ago to 
| distinguish different IDE controllers in VIA southbridges, that unfortunately
| used the same PCI identifiers (so he needed to examine some properties of
| the bridge to tell whether UDMA 100 was supported).
|
| IIRC he solved his problem - maybe worth looking, but maybe I'm completely
| misremembering this or it does not apply to this context.

His solution was to make use of pci_find_device(), which, ironically, is
just a wrapper around pci_probe_bus().

Eduardo