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2- general code review and cleanup
3- can this be converted to not require PCI_DRIVERS_LEGACY ??
4    The irq returned by pcibios_map_irq is a "hwirq" (hardware irq number)
5    and pci_assign_irq() assigns this directly to dev->irq, which
6    expects a "virq" (virtual irq number).  These numbers are different
7    on MIPS.  There is a gross hack to make it work on one
8    specific platform, so it can be tested.
9- Should this be merged with arch/mips/pci/pci-mt7620.c ??
10- ensure device-tree requirements are documented
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12Cc:  NeilBrown <neil@brown.name>
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