Some Altera UART implementations doesn't route the IRQ line, so we have
to work in polling mode.
Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>
Acked-by: NTobias Klauser <tklauser@distanz.ch>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>