Simplify baud rate register formula and use the oversampling uart feature. This code is aligned with what is implemented in kernel driver drivers/tty/serial/stm32-usart.c since kernel v4.9. Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Reviewed-by: Christophe KERELLO <christophe.kerello@st.com> Reviewed-by: Patrick DELAUNAY <patrick.delaunay@st.com> Acked-by: Vikas MANOCHA <vikas.manocha@st.com>master
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