| PCI bus bridges have standardized Device Tree bindings: |
| |
| PCI Bus Binding to: IEEE Std 1275-1994 |
| http://www.firmware.org/1275/bindings/pci/pci2_1.pdf |
| |
| And for the interrupt mapping part: |
| |
| Open Firmware Recommended Practice: Interrupt Mapping |
| http://www.firmware.org/1275/practice/imap/imap0_9d.pdf |
| |
| Additionally to the properties specified in the above standards a host bridge |
| driver implementation may support the following properties: |
| |
| - linux,pci-domain: |
| If present this property assigns a fixed PCI domain number to a host bridge, |
| otherwise an unstable (across boots) unique number will be assigned. |
| It is required to either not set this property at all or set it for all |
| host bridges in the system, otherwise potentially conflicting domain numbers |
| may be assigned to root buses behind different host bridges. The domain |
| number for each host bridge in the system must be unique. |
