serial: stm32: add FIFO threshold configuration
Add the support for two optional DT properties, to configure RX and TX FIFO thresholds: - rx-threshold - tx-threshold This replaces hard-coded 8 bytes threshold. Keep 8 as the default value if not specified, for backward compatibility. Signed-off-by:Fabrice Gasnier <fabrice.gasnier@foss.st.com> Signed-off-by:
Erwan Le Ray <erwan.leray@foss.st.com> Changes in v2: Change added properties naming as proposed by Rob Herring. Link: https://lore.kernel.org/r/20210413174015.23011-5-erwan.leray@foss.st.com Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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