This is a note to let you know that I've just added the patch titled
USB: ftdi_sio: enable two UART ports on ST Microconnect Lite
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-ftdi_sio-enable-two-uart-ports-on-st-microconnect-lite.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ae04c6d22a958d4879c4139ea57dee8a92243e42 Mon Sep 17 00:00:00 2001
From: Adrian Thomasset <adrian.thomasset@xxxxxx>
Date: Wed, 24 Apr 2013 11:37:35 +0100
Subject: USB: ftdi_sio: enable two UART ports on ST Microconnect Lite
From: Adrian Thomasset <adrian.thomasset@xxxxxx>
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@xxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
}
/*
Patches currently in stable-queue which might be from adrian.thomasset@xxxxxx are
queue-3.4/usb-ftdi_sio-enable-two-uart-ports-on-st-microconnect-lite.patch
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