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Based on kernel version 3.13. Page generated on 2014-01-20 22:00 EST.

1	What:		/sys/class/ptp/
2	Date:		September 2010
3	Contact:	Richard Cochran <richardcochran@gmail.com>
4	Description:
5			This directory contains files and directories
6			providing a standardized interface to the ancillary
7			features of PTP hardware clocks.
8	
9	What:		/sys/class/ptp/ptpN/
10	Date:		September 2010
11	Contact:	Richard Cochran <richardcochran@gmail.com>
12	Description:
13			This directory contains the attributes of the Nth PTP
14			hardware clock registered into the PTP class driver
15			subsystem.
16	
17	What:		/sys/class/ptp/ptpN/clock_name
18	Date:		September 2010
19	Contact:	Richard Cochran <richardcochran@gmail.com>
20	Description:
21			This file contains the name of the PTP hardware clock
22			as a human readable string. The purpose of this
23			attribute is to provide the user with a "friendly
24			name" and to help distinguish PHY based devices from
25			MAC based ones. The string does not necessarily have
26			to be any kind of unique id.
27	
28	What:		/sys/class/ptp/ptpN/max_adjustment
29	Date:		September 2010
30	Contact:	Richard Cochran <richardcochran@gmail.com>
31	Description:
32			This file contains the PTP hardware clock's maximum
33			frequency adjustment value (a positive integer) in
34			parts per billion.
35	
36	What:		/sys/class/ptp/ptpN/n_alarms
37	Date:		September 2010
38	Contact:	Richard Cochran <richardcochran@gmail.com>
39	Description:
40			This file contains the number of periodic or one shot
41			alarms offer by the PTP hardware clock.
42	
43	What:		/sys/class/ptp/ptpN/n_external_timestamps
44	Date:		September 2010
45	Contact:	Richard Cochran <richardcochran@gmail.com>
46	Description:
47			This file contains the number of external timestamp
48			channels offered by the PTP hardware clock.
49	
50	What:		/sys/class/ptp/ptpN/n_periodic_outputs
51	Date:		September 2010
52	Contact:	Richard Cochran <richardcochran@gmail.com>
53	Description:
54			This file contains the number of programmable periodic
55			output channels offered by the PTP hardware clock.
56	
57	What:		/sys/class/ptp/ptpN/pps_avaiable
58	Date:		September 2010
59	Contact:	Richard Cochran <richardcochran@gmail.com>
60	Description:
61			This file indicates whether the PTP hardware clock
62			supports a Pulse Per Second to the host CPU. Reading
63			"1" means that the PPS is supported, while "0" means
64			not supported.
65	
66	What:		/sys/class/ptp/ptpN/extts_enable
67	Date:		September 2010
68	Contact:	Richard Cochran <richardcochran@gmail.com>
69	Description:
70			This write-only file enables or disables external
71			timestamps. To enable external timestamps, write the
72			channel index followed by a "1" into the file.
73			To disable external timestamps, write the channel
74			index followed by a "0" into the file.
75	
76	What:		/sys/class/ptp/ptpN/fifo
77	Date:		September 2010
78	Contact:	Richard Cochran <richardcochran@gmail.com>
79	Description:
80			This file provides timestamps on external events, in
81			the form of three integers: channel index, seconds,
82			and nanoseconds.
83	
84	What:		/sys/class/ptp/ptpN/period
85	Date:		September 2010
86	Contact:	Richard Cochran <richardcochran@gmail.com>
87	Description:
88			This write-only file enables or disables periodic
89			outputs. To enable a periodic output, write five
90			integers into the file: channel index, start time
91			seconds, start time nanoseconds, period seconds, and
92			period nanoseconds. To disable a periodic output, set
93			all the seconds and nanoseconds values to zero.
94	
95	What:		/sys/class/ptp/ptpN/pps_enable
96	Date:		September 2010
97	Contact:	Richard Cochran <richardcochran@gmail.com>
98	Description:
99			This write-only file enables or disables delivery of
100			PPS events to the Linux PPS subsystem. To enable PPS
101			events, write a "1" into the file. To disable events,
102			write a "0" into the file.
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