两个USB转串口，上电时可以一个固定设置识别为为ttyUSB0，一个固定为ttyUSB1么？

privatesky911

方法：
drivers/usb/serial/usb-serial.c

//根据USB232的USB路径设置定义
+#define DEVPATH_TTYUSB0                "1.4.1"
+#define DEVPATH_TTYUSB1                "1.4.2"
+#define DEVPATH_TTYUSB2                "1.4.3"

@@ -117,6 +116,15 @@ static struct usb_serial *get_free_serial(struct usb_serial *serial,
                a= BP_USB_PORT;
#endif

//预留ttyUSB0/1/2
+        // reserved minor 0-2 for build in usb-serial
+         if ((strcmp(serial->dev->devpath, DEVPATH_TTYUSB0) != 0) ||
+                (strcmp(serial->dev->devpath, DEVPATH_TTYUSB1) != 0) ||
+                (strcmp(serial->dev->devpath, DEVPATH_TTYUSB2) != 0) ){
+                a = 3;
+                dbg("\n%s - not build in usb serail device, minor from = %d\n", __func__, a);
+        }
+
+
        for (i = a; i < SERIAL_TTY_MINORS; ++i) {
                if (serial_table[i])
                        continue;

@@ -131,7 +139,20 @@ static struct usb_serial *get_free_serial(struct usb_serial *serial,
                if (good_spot == 0)
                        continue;
//检测到USB232设备，分配已经留的设备名
+                // defined minor 0-2 for build in usb-serial
+                if (strcmp(serial->dev->devpath, DEVPATH_TTYUSB0) == 0) {
+                        i = 0;
+                        dbg("\n%s - devpath = %s, force minor = %d\n", __func__, serial->dev->devpath, i);
+                }else if (strcmp(serial->dev->devpath, DEVPATH_TTYUSB1) == 0) {
+                        i = 1;
+                        dbg("\n%s - devpath = %s, force minor = %d\n", __func__, serial->dev->devpath, i);
+                } else if (strcmp(serial->dev->devpath, DEVPATH_TTYUSB2) == 0) {
+                        i = 2;
+                        dbg("\n%s - devpath = %s, force minor = %d\n", __func__, serial->dev->devpath, i);
+                }
+               
                *minor = i;
+               
                j = 0;
                dbg("%s - minor base = %d", __func__, *minor);
                for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) {