Hi Greg,
These two patches should probably be part of the 4.4 because ce59e48fdbad ("serial: mctrl_gpio: implement interrupt handling") backport. 4.9, 4.14 and 4.16 have these patches already in it.
Romain Izard (1): serial: mctrl_gpio: Add missing module license
Uwe Kleine-König (1): serial: mctrl_gpio: export mctrl_gpio_disable_ms and mctrl_gpio_init
drivers/tty/serial/serial_mctrl_gpio.c | 5 +++++ 1 file changed, 5 insertions(+)