DS3231 has programmable square-wave output signal.
This enables to use this feature as a clock provider of
common clock framework.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: NMichael Turquette <mturquette@baylibre.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>