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drivers: auxdisplay: hd44780: implement busy-flag polling mechanism
HD44780 controller can indicate via busy flag whether it's finished processing current command. This allows for faster completion of HD44780 commands as seen from MCU perspective, as the MCU doesn't have to wait for fixed long period of time. Implement this functionality. Signed-off-by: Jan Kuliga <jtkuliga@gmail.com>
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