drivers/vsllink: add help and usage to commands

Change-Id: I4a8a68147011525191ca79e65fc3d7e760371ae1
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5020
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/jtag/drivers/vsllink.c

@@ -919,31 +919,43 @@ static const struct command_registration vsllink_command_handlers[] = {
 		.name = "vsllink_usb_vid",
 		.handler = &vsllink_handle_usb_vid_command,
 		.mode = COMMAND_CONFIG,
+		.help = "Set USB VID",
+		.usage = "<vid>",
 	},
 	{
 		.name = "vsllink_usb_pid",
 		.handler = &vsllink_handle_usb_pid_command,
 		.mode = COMMAND_CONFIG,
+		.help = "Set USB PID",
+		.usage = "<pid>",
 	},
 	{
 		.name = "vsllink_usb_serial",
 		.handler = &vsllink_handle_usb_serial_command,
 		.mode = COMMAND_CONFIG,
+		.help = "Set or disable check for USB serial",
+		.usage = "[<serial>]",
 	},
 	{
 		.name = "vsllink_usb_bulkin",
 		.handler = &vsllink_handle_usb_bulkin_command,
 		.mode = COMMAND_CONFIG,
+		.help = "Set USB input endpoint",
+		.usage = "<ep_in>",
 	},
 	{
 		.name = "vsllink_usb_bulkout",
 		.handler = &vsllink_handle_usb_bulkout_command,
 		.mode = COMMAND_CONFIG,
+		.help = "Set USB output endpoint",
+		.usage = "<ep_out>",
 	},
 	{
 		.name = "vsllink_usb_interface",
 		.handler = &vsllink_handle_usb_interface_command,
 		.mode = COMMAND_CONFIG,
+		.help = "Set USB output interface",
+		.usage = "<interface>",
 	},
 	COMMAND_REGISTRATION_DONE
 };