1PCI bus bridges have standardized Device Tree bindings:
2
3PCI Bus Binding to: IEEE Std 1275-1994
4http://www.openfirmware.org/ofwg/bindings/pci/pci2_1.pdf
5
6And for the interrupt mapping part:
7
8Open Firmware Recommended Practice: Interrupt Mapping
9http://www.openfirmware.org/1275/practice/imap/imap0_9d.pdf
10