This is used by drivers/tty/serial/rp2.c.
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Grant Edwards <grant.edwards@comtrol.com>
Signed-off-by: Nick Thompson <nick.thompson@comtrol.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
