1What:		/sys/class/devlink/.../
2Date:		May 2020
3Contact:	Saravana Kannan <saravanak@google.com>
4Description:
5		Provide a place in sysfs for the device link objects in the
6		kernel at any given time.  The name of a device link directory,
7		denoted as ... above, is of the form <supplier>:<consumer>
8		where <supplier> is the supplier device name and <consumer> is
9		the consumer device name.
10
11What:		/sys/class/devlink/.../auto_remove_on
12Date:		May 2020
13Contact:	Saravana Kannan <saravanak@google.com>
14Description:
15		This file indicates if the device link will ever be
16		automatically removed by the driver core when the consumer and
17		supplier devices themselves are still present.
18
19		This will be one of the following strings:
20
21		'consumer unbind'
22		'supplier unbind'
23		'never'
24
25		'consumer unbind' means the device link will be removed when
26		the consumer's driver is unbound from the consumer device.
27
28		'supplier unbind' means the device link will be removed when
29		the supplier's driver is unbound from the supplier device.
30
31		'never' means the device link will not be automatically removed
32		when as long as the supplier and consumer devices themselves
33		are still present.
34
35What:		/sys/class/devlink/.../consumer
36Date:		May 2020
37Contact:	Saravana Kannan <saravanak@google.com>
38Description:
39		This file is a symlink to the consumer device's sysfs directory.
40
41What:		/sys/class/devlink/.../runtime_pm
42Date:		May 2020
43Contact:	Saravana Kannan <saravanak@google.com>
44Description:
45		This file indicates if the device link has any impact on the
46		runtime power management behavior of the consumer and supplier
47		devices. For example: Making sure the supplier doesn't enter
48		runtime suspend while the consumer is active.
49
50		This will be one of the following strings:
51
52		'0' - Does not affect runtime power management
53		'1' - Affects runtime power management
54
55What:		/sys/class/devlink/.../status
56Date:		May 2020
57Contact:	Saravana Kannan <saravanak@google.com>
58Description:
59		This file indicates the status of the device link. The status
60		of a device link is affected by whether the supplier and
61		consumer devices have been bound to their corresponding
62		drivers. The status of a device link also affects the binding
63		and unbinding of the supplier and consumer devices with their
64		drivers and also affects whether the software state of the
65		supplier device is synced with the hardware state of the
66		supplier device after boot up.
67		See also: sysfs-devices-state_synced.
68
69		This will be one of the following strings:
70
71		'not tracked'
72		'dormant'
73		'available'
74		'consumer probing'
75		'active'
76		'supplier unbinding'
77		'unknown'
78
79		'not tracked' means this device link does not track the status
80		and has no impact on the binding, unbinding and syncing the
81		hardware and software device state.
82
83		'dormant' means the supplier and the consumer devices have not
84		bound to their driver.
85
86		'available' means the supplier has bound to its driver and is
87		available to supply resources to the consumer device.
88
89		'consumer probing' means the consumer device is currently
90		trying to bind to its driver.
91
92		'active' means the supplier and consumer devices have both
93		bound successfully to their drivers.
94
95		'supplier unbinding' means the supplier devices is currently in
96		the process of unbinding from its driver.
97
98		'unknown' means the state of the device link is not any of the
99		above. If this is ever the value, there's a bug in the kernel.
100
101What:		/sys/class/devlink/.../supplier
102Date:		May 2020
103Contact:	Saravana Kannan <saravanak@google.com>
104Description:
105		This file is a symlink to the supplier device's sysfs directory.
106
107What:		/sys/class/devlink/.../sync_state_only
108Date:		May 2020
109Contact:	Saravana Kannan <saravanak@google.com>
110Description:
111		This file indicates if the device link is limited to only
112		affecting the syncing of the hardware and software state of the
113		supplier device.
114
115		This will be one of the following strings:
116
117		'0'
118		'1' - Affects runtime power management
119
120		'0' means the device link can affect other device behaviors
121		like binding/unbinding, suspend/resume, runtime power
122		management, etc.
123
124		'1' means the device link will only affect the syncing of
125		hardware and software state of the supplier device after boot
126		up and doesn't not affect other behaviors of the devices.
127