Commit 71d9a2b9 authored by Adrian Thomasset's avatar Adrian Thomasset Committed by Greg Kroah-Hartman
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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: default avatarAdrian Thomasset <>
Cc: stable <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent ee5d5499
......@@ -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;
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