Paul Brook wrote: >>> I think this would be better served by adding explicit aliases/IDs for >>> those use-cases. i.e. define the global ID "pci.0" to be an alias for >>> >>> /i440FX-pcihost/pci >> Makes sense. We could attach this ID to the BusState (corresponding to >> DeviceState:id) and manually set it during machine init. >> qbus_find_recursive would then look for a matching ID instead of a name. > > If we accept your proposal that global ids are not accepted as local device > identifiers, then these probably shouldn't be stored in the device tree at > all. > > Allowing at most one global ID per node also seems like a rather arbitrary > limitation. > > How about having a global alias table that maps an ID to a devtree path? > The code to handle these becomes a straight string substitution followed by a > normal path lookup. We don't need separate code for device v.s. bus, and > "global_device_id/busname" just works.
No principle concerns about such a table. It should nevertheless be reference-based to assist lifetime management of aliases that are created together with the devices they point to. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux
