diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/serial/ftdi_sio.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 2298813af114..7862220cba34 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1855,8 +1855,11 @@ static int ftdi_8u2232c_probe(struct usb_serial *serial) } /* - * First and second port on STMCLiteadaptors is reserved for JTAG interface - * and the forth port for pio + * First two ports on JTAG adaptors using an FT4232 such as STMicroelectronics's + * ST Micro Connect Lite are reserved for JTAG or other non-UART interfaces and + * can be accessed from userspace. + * The next two ports are enabled as UARTs by default, where port 2 is + * a conventional RS-232 UART. */ static int ftdi_stmclite_probe(struct usb_serial *serial) { @@ -1865,12 +1868,13 @@ static int ftdi_stmclite_probe(struct usb_serial *serial) dbg("%s", __func__); - if (interface == udev->actconfig->interface[2]) - return 0; - - dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n"); + if (interface == udev->actconfig->interface[0] || + interface == udev->actconfig->interface[1]) { + dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n"); + return -ENODEV; + } - return -ENODEV; + return 0; } /* |