tty/serial: Add rx-tx-swap OF option to stm32-usart
STM32 F7/H7 usarts supports RX & TX pin swapping. Add option to turn it on. Tested on STM32MP157. Acked-by: NFabrice Gasnier <fabrice.gasnier@foss.st.com> Signed-off-by: NMartin Devera <devik@eaxlabs.cz> Link: https://lore.kernel.org/r/20210328154306.22674-2-devik@eaxlabs.czSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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