Documentation: devlink: add devlink documentation for the kvaser_usb driver

List the version information reported by the kvaser_usb driver
through devlink.

Suggested-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Link: https://patch.msgid.link/20250725123452.41-12-extja@kvaser.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Author: Jimmy Assarsson

Documentation/networking/devlink/index.rst

@@ -86,6 +86,7 @@ parameters, info versions, and other features it supports.
    ice
    ixgbe
    kvaser_pciefd
+   kvaser_usb
    mlx4
    mlx5
    mlxsw

Documentation/networking/devlink/kvaser_usb.rst

@@ -0,0 +1,33 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========================
+kvaser_usb devlink support
+==========================
+
+This document describes the devlink features implemented by the
+``kvaser_usb`` device driver.
+
+Info versions
+=============
+
+The ``kvaser_usb`` driver reports the following versions
+
+.. list-table:: devlink info versions implemented
+   :widths: 5 5 90
+
+   * - Name
+     - Type
+     - Description
+   * - ``fw``
+     - running
+     - Version of the firmware running on the device. Also available
+       through ``ethtool -i`` as ``firmware-version``.
+   * - ``board.rev``
+     - fixed
+     - The device hardware revision.
+   * - ``board.id``
+     - fixed
+     - The device EAN (product number).
+   * - ``serial_number``
+     - fixed
+     - The device serial number.