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+Link Layer Validation Device is a standard device for testing of Super
+Speed Link Layer tests. These nodes are available in sysfs only when lvs
+driver is bound with root hub device.
+
+What: /sys/bus/usb/devices/.../get_dev_desc
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@gmail.com>
+Description:
+ Write to this node to issue "Get Device Descriptor"
+ for Link Layer Validation device. It is needed for TD.7.06.
+
+What: /sys/bus/usb/devices/.../u1_timeout
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@gmail.com>
+Description:
+ Set "U1 timeout" for the downstream port where Link Layer
+ Validation device is connected. Timeout value must be between 0
+ and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
+
+What: /sys/bus/usb/devices/.../u2_timeout
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@gmail.com>
+Description:
+ Set "U2 timeout" for the downstream port where Link Layer
+ Validation device is connected. Timeout value must be between 0
+ and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
+
+What: /sys/bus/usb/devices/.../hot_reset
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@gmail.com>
+Description:
+ Write to this node to issue "Reset" for Link Layer Validation
+ device. It is needed for TD.7.29, TD.7.31, TD.7.34 and TD.7.35.
+
+What: /sys/bus/usb/devices/.../u3_entry
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@gmail.com>
+Description:
+ Write to this node to issue "U3 entry" for Link Layer
+ Validation device. It is needed for TD.7.35 and TD.7.36.
+
+What: /sys/bus/usb/devices/.../u3_exit
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@gmail.com>
+Description:
+ Write to this node to issue "U3 exit" for Link Layer
+ Validation device. It is needed for TD.7.36.
+
+What: /sys/bus/usb/devices/.../enable_compliance
+Date: July 2017
+Description:
+ Write to this node to set the port to compliance mode to test
+ with Link Layer Validation device. It is needed for TD.7.34.
+
+What: /sys/bus/usb/devices/.../warm_reset
+Date: July 2017
+Description:
+ Write to this node to issue "Warm Reset" for Link Layer Validation
+ device. It may be needed to properly reset an xHCI 1.1 host port if
+ compliance mode needed to be explicitly enabled.