diff options
| author | Adrian Thomasset <adrian.thomasset@st.com> | 2013-04-24 11:37:35 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-24 09:05:30 -0700 |
| commit | 71d9a2b95fc9c9474d46d764336efd7a5a805555 (patch) | |
| tree | 372354a37f06e120034126dfd874d2cf3d12bc53 /drivers/usb/serial/ftdi_sio.c | |
| parent | ee5d5499edb94cd03738a52a7e234b139da8fd72 (diff) | |
| download | linux-71d9a2b95fc9c9474d46d764336efd7a5a805555.tar.bz2 | |
USB: ftdi_sio: enable two UART ports on ST Microconnect Lite
The FT4232H used in the ST Micro Connect Lite has four hi-speed UART ports.
The first two ports are reserved for the JTAG interface.
We enable by default ports 2 and 3 as UARTs (where port 2 is a
conventional RS-232 UART)
Signed-off-by: Adrian Thomasset <adrian.thomasset@st.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial/ftdi_sio.c')
| -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 e4d7fbd7e4e7..242b5776648a 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1789,20 +1789,24 @@ 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) { struct usb_device *udev = serial->dev; struct usb_interface *interface = serial->interface; - 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; } /* |