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Some serial ports may have unusal requirements for interrupt handling (e.g. the Synopsys DesignWare 8250-alike port and it's busy detect interrupt). Add a .handle_irq callback that can be used for platforms to override the interrupt behaviour in a similar fashion to the .serial_out and .serial_in callbacks. Signed-off-by: Jamie Iles <jamie@jamieiles.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>