[Drivers] Make code cleanup in serial framework.

components/drivers/include/drivers/serial.h

@@ -30,9 +30,15 @@
 
 #include <rtthread.h>
 
+#define BAUD_RATE_2400                  2400
 #define BAUD_RATE_4800                  4800
 #define BAUD_RATE_9600                  9600
+#define BAUD_RATE_38400                 38400
+#define BAUD_RATE_57600                 57600
 #define BAUD_RATE_115200                115200
+#define BAUD_RATE_230400                230400
+#define BAUD_RATE_460800                460800
+#define BAUD_RATE_921600                921600
 
 #define DATA_BITS_5                     5
 #define DATA_BITS_6                     6

components/drivers/serial/serial.c

@@ -162,9 +162,6 @@ static rt_err_t rt_serial_init(struct rt_device *dev)
             rt_data_queue_init(&(serial->tx_dq), RT_SERIAL_TX_DATAQUEUE_SIZE,
                                RT_SERIAL_TX_DATAQUEUE_LWM, RT_NULL);
         }
-
-        /* set activated */
-        dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
     }
 
     return result;