What to set uart_port->irq to for polled driver?

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For a polled serial driver that doesn't use interrupts, to what should
the "irq" field in the uart_port structure be set?  Should it be 0?
Should it be the unused IRQ associated with the PCI card slot in which
the board is found?

-- 
Grant Edwards               grant.b.edwards        Yow! MERYL STREEP is my
                                  at               obstetrician!
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