Damien George 86e0b25532 stm32/spi: Round up prescaler calc to never exceed requested baudrate.
Requesting a baudrate of X should never configure the peripheral to have a
baudrate greater than X because connected hardware may not be able to
handle higher speeds.  This patch makes sure to round the prescaler up so
that the actual baudrate is rounded down.
2018-08-10 16:39:47 +10:00
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