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    Subject[PATCH 3.4 073/134] USB: ftdi_sio: enable two UART ports on ST Microconnect Lite
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Adrian Thomasset <adrian.thomasset@st.com>

    commit 71d9a2b95fc9c9474d46d764336efd7a5a805555 upstream.

    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>
    [bwh: Backported to 3.2: adjust context]
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    Cc: Yang Yingliang <yangyingliang@huawei.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/serial/ftdi_sio.c | 18 +++++++++++-------
    1 file changed, 11 insertions(+), 7 deletions(-)

    --- 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
    }

    /*
    - * 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 us

    dbg("%s", __func__);

    - if (interface == udev->actconfig->interface[2])
    - return 0;
    + if (interface == udev->actconfig->interface[0] ||
    + interface == udev->actconfig->interface[1]) {
    + dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n");
    + return -ENODEV;
    + }

    - dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n");
    -
    - return -ENODEV;
    + return 0;
    }

    /*



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