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