serial: fsl_lpuart: fix maximum acceptable baud rate with over-sampling
Using over-sampling ratio, lpuart can accept baud rate upto uartclk / 4. Signed-off-by: NTomonori Sakita <tomonori.sakita@sord.co.jp> Signed-off-by: NAtsushi Nemoto <atsushi.nemoto@sord.co.jp> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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