Add DT bindings documentation for lpc3220-timer. This timer is
used as clocksource on many NXP platforms.
Signed-off-by: NJoachim Eastwood <manabian@gmail.com>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>