Based on kernel version 4.13.3. Page generated on 2017-09-23 13:55 EST.
1 PCI bus bridges have standardized Device Tree bindings: 2 3 PCI Bus Binding to: IEEE Std 1275-1994 4 http://www.firmware.org/1275/bindings/pci/pci2_1.pdf 5 6 And for the interrupt mapping part: 7 8 Open Firmware Recommended Practice: Interrupt Mapping 9 http://www.firmware.org/1275/practice/imap/imap0_9d.pdf 10 11 Additionally to the properties specified in the above standards a host bridge 12 driver implementation may support the following properties: 13 14 - linux,pci-domain: 15 If present this property assigns a fixed PCI domain number to a host bridge, 16 otherwise an unstable (across boots) unique number will be assigned. 17 It is required to either not set this property at all or set it for all 18 host bridges in the system, otherwise potentially conflicting domain numbers 19 may be assigned to root buses behind different host bridges. The domain 20 number for each host bridge in the system must be unique. 21 - max-link-speed: 22 If present this property specifies PCI gen for link capability. Host 23 drivers could add this as a strategy to avoid unnecessary operation for 24 unsupported link speed, for instance, trying to do training for 25 unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2' 26 for gen2, and '1' for gen1. Any other values are invalid.