linux-kernel - [PATCH 3.4 073/134] USB: ftdi_sio: enable two UART ports on ST Microconnect Lite

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Message-Id: <20140410032309.392318097@linuxfoundation.org>
Date:	Wed,  9 Apr 2014 20:23:09 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Adrian Thomasset <adrian.thomasset@...com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 3.4 073/134] USB: ftdi_sio: enable two UART ports on ST Microconnect Lite

3.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Adrian Thomasset <adrian.thomasset@...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@...com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Yang Yingliang <yangyingliang@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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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