[PATCH] Documentation: usb: serial: fixed how to provide vendor and product id

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From: "H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx>

While trying to test the Pyra GSM/GPS/3G module I had reconfigured
the USB interface by mistake and therefore needed to run a different
USB driver than CSC-ACM. It turned out that I need the "usbserial" driver.

This file is an official description how to use it:
Documentation/usb/usb-serial.txt

But it is outdated. The parameters vendor= and product= are no longer
available since ca. 3.12 which means that documentation is lagging behind
quite some time.

Here was the solution:

https://bbs.archlinux.org/viewtopic.php?id=175499

  insmod usbserial vendor=0x#### product=0x####

becomes (first #### is vendor, second is product)

  modprobe usbserial
  echo #### #### >/sys/bus/usb-serial/drivers/generic/new_id

This patch changes the documentation file as needed.

Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
Signed-off-by: Marek Belisko <marek@xxxxxxxxxxxxx>
---
 Documentation/usb/usb-serial.txt | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/Documentation/usb/usb-serial.txt b/Documentation/usb/usb-serial.txt
index 947fa62..9f184d8 100644
--- a/Documentation/usb/usb-serial.txt
+++ b/Documentation/usb/usb-serial.txt
@@ -466,11 +466,13 @@ Generic Serial driver
   is required of your device is that it has at least one bulk in endpoint,
   or one bulk out endpoint. 
   
-  To enable the generic driver to recognize your device, build the driver
-  as a module and load it by the following invocation:
-	insmod usbserial vendor=0x#### product=0x####
-  where the #### is replaced with the hex representation of your device's
-  vendor id and product id.
+  To enable the generic driver to recognize your device, configure
+  USB_SERIAL_GENERIC=y and build the driver as a module. Then load it by the
+  following invocation:
+	modprobe usbserial
+	echo #### #### >/sys/bus/usb-serial/drivers/generic/new_id
+  where the the first #### is replaced with the hex representation of your
+  device's vendor id and the second #### by the product id.
 
   This driver has been successfully used to connect to the NetChip USB
   development board, providing a way to develop USB firmware without
-- 
1.9.1

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