The earlier patch can be simplified by using a bool
to indicate level trigger.

BugLink: http://bugs.launchpad.net/bugs/1612006Reviewed-by: Pankaj Sen <Pankaj.Sen@amd.com>
Signed-off-by: Nitesh Kumar Agrawal <Nitesh-kumar.Agrawal@amd.com>
[Fixup to earlier manually applied patch]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

(cherry picked from commit e084448b)
Signed-off-by: Alex Hung <alex.hung@canonical.com>
Acked-by: Robert Hooker <robert.hooker@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>