1Link Layer Validation Device is a standard device for testing of Super
2Speed Link Layer tests. These nodes are available in sysfs only when lvs
3driver is bound with root hub device.
4
5What:		/sys/bus/usb/devices/.../get_dev_desc
6Date:		March 2014
7Contact:	Pratyush Anand <pratyush.anand@gmail.com>
8Description:
9		Write to this node to issue "Get Device Descriptor"
10		for Link Layer Validation device. It is needed for TD.7.06.
11
12What:		/sys/bus/usb/devices/.../u1_timeout
13Date:		March 2014
14Contact:	Pratyush Anand <pratyush.anand@gmail.com>
15Description:
16		Set "U1 timeout" for the downstream port where Link Layer
17		Validation device is connected. Timeout value must be between 0
18		and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
19
20What:		/sys/bus/usb/devices/.../u2_timeout
21Date:		March 2014
22Contact:	Pratyush Anand <pratyush.anand@gmail.com>
23Description:
24		Set "U2 timeout" for the downstream port where Link Layer
25		Validation device is connected. Timeout value must be between 0
26		and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
27
28What:		/sys/bus/usb/devices/.../hot_reset
29Date:		March 2014
30Contact:	Pratyush Anand <pratyush.anand@gmail.com>
31Description:
32		Write to this node to issue "Reset" for Link Layer Validation
33		device. It is needed for TD.7.29, TD.7.31, TD.7.34 and TD.7.35.
34
35What:		/sys/bus/usb/devices/.../u3_entry
36Date:		March 2014
37Contact:	Pratyush Anand <pratyush.anand@gmail.com>
38Description:
39		Write to this node to issue "U3 entry" for Link Layer
40		Validation device. It is needed for TD.7.35 and TD.7.36.
41
42What:		/sys/bus/usb/devices/.../u3_exit
43Date:		March 2014
44Contact:	Pratyush Anand <pratyush.anand@gmail.com>
45Description:
46		Write to this node to issue "U3 exit" for Link Layer
47		Validation device. It is needed for TD.7.36.
48
49What:		/sys/bus/usb/devices/.../enable_compliance
50Date:		July 2017
51Description:
52		Write to this node to set the port to compliance mode to test
53		with Link Layer Validation device. It is needed for TD.7.34.
54
55What:		/sys/bus/usb/devices/.../warm_reset
56Date:		July 2017
57Description:
58		Write to this node to issue "Warm Reset" for Link Layer Validation
59		device. It may be needed to properly reset an xHCI 1.1 host port if
60		compliance mode needed to be explicitly enabled.
61