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Hardware is capable of inverting RTS signal when working in RS-485 mode. Expose this functionality to user space. Relay on a matching combination of standard flags (SER_RS485_RTS_ON_SEND and SER_RS485_RTS_AFTER_SEND) to detect when user space is requesting inverted RTS mode. Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Jon Ringle <jringle@gridpoint.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>