This flag is supposed to be used by uart drivers using software rs485 direction 
control.

Signed-off-by: Matwey V. Kornilov <[email protected]>
---
 include/uapi/linux/serial.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h
index 25331f9..95b15ca 100644
--- a/include/uapi/linux/serial.h
+++ b/include/uapi/linux/serial.h
@@ -121,6 +121,9 @@ struct serial_rs485 {
 #define SER_RS485_RTS_AFTER_SEND       (1 << 2)        /* Logical level for
                                                           RTS pin after sent*/
 #define SER_RS485_RX_DURING_TX         (1 << 4)
+#define SER_RS485_SOFTWARE             (1 << 5)        /* Software
+                                                          implementation is
+                                                          being used */
        __u32   delay_rts_before_send;  /* Delay before send (milliseconds) */
        __u32   delay_rts_after_send;   /* Delay after send (milliseconds) */
        __u32   padding[5];             /* Memory is cheap, new structs
-- 
2.6.2

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