This patch series adds RS422 flag to switch the serial interface into RS422 if supported by using "TIOCSRS485" ioctl command. --- Changes from v5 to v6: - Split patch into cleanup patch and new feature patch - [PATCH v6 2/2]: - Add termination resistors support for RS422 Changes from v4 to v5: - Revise commit message. - Delete RS422 checks within uart_set_rs485_termination(). Changes from v3 to v4: - Include 'linux/const.h' header in '/include/uapi/linux/serial.h' - Replace BIT() with _BITUL() which defined in '/include/uapi/linux/const.h' Changes from v2 to v3: - Remove "SER_RS422_ENABLED" flag from legacy flags. - Revise "SER_RS422_ENABLED" into "SER_RS485_MODE_RS422". - Remove the code which checks the conflicts between SER_RS485_ENABLED and SER_RS422_ENABLED. - Add return check in uart_set_rs485_termination(). Changes from v1 to v2: - Revise the logic that checks whether RS422/RS485 are enabled simultaneously. v5: https://lore.kernel.org/all/20231121095122.15948-1-crescentcy.hsieh@xxxxxxxx/ v4: https://lore.kernel.org/all/20231113094136.52003-1-crescentcy.hsieh@xxxxxxxx/ v3: https://lore.kernel.org/all/20231108060719.11775-1-crescentcy.hsieh@xxxxxxxx/ v2: https://lore.kernel.org/all/20231101064404.45711-1-crescentcy.hsieh@xxxxxxxx/ v1: https://lore.kernel.org/all/20231030053632.5109-1-crescentcy.hsieh@xxxxxxxx/ Crescent CY Hsieh (2): tty: serial: Cleanup the bit shift with macro tty: serial: Add RS422 flag to struct serial_rs485 drivers/tty/serial/serial_core.c | 6 ++++++ include/uapi/linux/serial.h | 19 +++++++++++-------- 2 files changed, 17 insertions(+), 8 deletions(-) -- 2.34.1
