From: Dashi DS1 Cao <caods1@lenovo.com>
To: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: Add TI ICDI as a simple usb serial device
Thread-Topic: Add TI ICDI as a simple usb serial device
Thread-Index: AdMq9szefsTXcSLXT36ZlOHMNkV9UgAAX9tA
Date: Mon, 11 Sep 2017 12:22:57 +0000
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Sorry! Should have submitted the patch inline:

---
 drivers/usb/serial/usb-serial-simple.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/usb-serial-simple.c b/drivers/usb/serial/usb-serial-simple.c
index e98b6e5..7727eab 100644
--- a/drivers/usb/serial/usb-serial-simple.c
+++ b/drivers/usb/serial/usb-serial-simple.c
@@ -32,7 +32,7 @@ static struct usb_serial_driver vendor##_device = {		\
 	},							\
 	.id_table =		vendor##_id_table,		\
 	.num_ports =		nport,				\
-};
+}
 
 #define DEVICE(vendor, IDS)	DEVICE_N(vendor, IDS, 1)
 
@@ -58,6 +58,10 @@ DEVICE(funsoft, FUNSOFT_IDS);
 	{ USB_DEVICE(0x8087, 0x0801) }
 DEVICE(flashloader, FLASHLOADER_IDS);
 
+#define ICDI_IDS()		\
+	{ USB_DEVICE_INTERFACE_CLASS(0x1cbe, 0x00fd, USB_CLASS_VENDOR_SPEC) }
+DEVICE(icdi, ICDI_IDS);
+
 /* Google Serial USB SubClass */
 #define GOOGLE_IDS()						\
 	{ USB_VENDOR_AND_INTERFACE_INFO(0x18d1,			\
@@ -114,6 +118,7 @@ static struct usb_serial_driver * const serial_drivers[] = {
 	&hp4x_device,
 	&suunto_device,
 	&siemens_mpi_device,
+	&icdi_device,
 	NULL
 };
 
@@ -129,6 +134,7 @@ static const struct usb_device_id id_table[] = {
 	HP4X_IDS(),
 	SUUNTO_IDS(),
 	SIEMENS_IDS(),
+	ICDI_IDS(),
 	{ },
 };
 MODULE_DEVICE_TABLE(usb, id_table);
-- 
2.1.4

The TI ICDI is an integrated debugger interface for its TM4C series microcontroller chip. It is a USB interface which can be used just like a USB serial device.
A few lines of codes added to the file "drivers/usb/serial/usb-serial-simple.c" accomplishes this job. And it can be used to upload/download firmware for the TI TM4C12x series. I think GDB can also use this serial device to do the debugging of TM4C12x.
This patch is based on version 4.9.48.

Thanks,
Dashi Cao