1 files changed, 8 insertions, 6 deletions

diff --git a/include/linux/serial.h b/include/linux/serial.h
index 97ff8e27a6cc..3d86517fe7d5 100644
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -207,13 +207,15 @@ struct serial_icounter_struct {
 
 struct serial_rs485 {
         __u32   flags;                  /* RS485 feature flags */
-#define SER_RS485_ENABLED               (1 << 0)
-#define SER_RS485_RTS_ON_SEND           (1 << 1)
-#define SER_RS485_RTS_AFTER_SEND        (1 << 2)
-#define SER_RS485_RTS_BEFORE_SEND       (1 << 3)
+#define SER_RS485_ENABLED               (1 << 0)        /* If enabled */
+#define SER_RS485_RTS_ON_SEND           (1 << 1)        /* Logical level for
+                                                           RTS pin when
+                                                           sending */
+#define SER_RS485_RTS_AFTER_SEND        (1 << 2)        /* Logical level for
+                                                           RTS pin after sent*/
 #define SER_RS485_RX_DURING_TX          (1 << 4)
-        __u32   delay_rts_before_send;  /* Milliseconds */
-        __u32   delay_rts_after_send;   /* Milliseconds */
+        __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
                                            are a royal PITA .. */
 };