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.

Cc: Alan Cox <redacted>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jamie Iles <redacted>
---
 include/linux/serial_core.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index a5c3114..b6fa317 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h

@@ -300,6 +300,7 @@ struct uart_port {
 	void			(*set_termios)(struct uart_port *,
 				               struct ktermios *new,
 				               struct ktermios *old);
+	int			(*handle_irq)(struct uart_port *);
 	void			(*pm)(struct uart_port *, unsigned int state,
 				      unsigned int old);
 	unsigned int		irq;			/* irq number */

-- 
1.7.4.1