1 What: /sys/class/ptp/
2 Date: September 2010
3 Contact: Richard Cochran <richardcochran
4 Description:
5 This directory contains files
6 providing a standardized inter
7 features of PTP hardware clock
8
9 What: /sys/class/ptp/ptp<N>/
10 Date: September 2010
11 Contact: Richard Cochran <richardcochran
12 Description:
13 This directory contains the at
14 hardware clock registered into
15 subsystem.
16
17 What: /sys/class/ptp/ptp<N>/clock_na
18 Date: September 2010
19 Contact: Richard Cochran <richardcochran
20 Description:
21 This file contains the name of
22 as a human readable string. Th
23 attribute is to provide the us
24 name" and to help distinguish
25 MAC based ones. The string doe
26 to be any kind of unique id.
27
28 What: /sys/class/ptp/ptp<N>/max_adju
29 Date: September 2010
30 Contact: Richard Cochran <richardcochran
31 Description:
32 This file contains the PTP har
33 frequency adjustment value (a
34 parts per billion.
35
36 What: /sys/class/ptp/ptp<N>/max_vclo
37 Date: May 2021
38 Contact: Yangbo Lu <yangbo.lu@nxp.com>
39 Description:
40 This file contains the maximum
41 Write integer to re-configure
42
43 What: /sys/class/ptp/ptp<N>/n_alarms
44 Date: September 2010
45 Contact: Richard Cochran <richardcochran
46 Description:
47 This file contains the number
48 alarms offer by the PTP hardwa
49
50 What: /sys/class/ptp/ptp<N>/n_extern
51 Date: September 2010
52 Contact: Richard Cochran <richardcochran
53 Description:
54 This file contains the number
55 channels offered by the PTP ha
56
57 What: /sys/class/ptp/ptp<N>/n_period
58 Date: September 2010
59 Contact: Richard Cochran <richardcochran
60 Description:
61 This file contains the number
62 output channels offered by the
63
64 What: /sys/class/ptp/ptp<N>/n_pins
65 Date: March 2014
66 Contact: Richard Cochran <richardcochran
67 Description:
68 This file contains the number
69 offered by the PTP hardware cl
70
71 What: /sys/class/ptp/ptp<N>/n_vclock
72 Date: May 2021
73 Contact: Yangbo Lu <yangbo.lu@nxp.com>
74 Description:
75 This file contains the number
76 use. By default, the value is
77 physical clock is in use. Set
78 the corresponding number of vi
79 the physical clock to become f
80 value back to 0 deletes the vi
81 switches the physical clock ba
82 operation.
83
84 What: /sys/class/ptp/ptp<N>/pins
85 Date: March 2014
86 Contact: Richard Cochran <richardcochran
87 Description:
88 This directory contains one fi
89 pin offered by the PTP hardwar
90 is the hardware dependent pin
91 file produces two numbers, the
92 the `PTP_PF_` enumeration valu
93 and the channel number. The fu
94 assignment may be changed by t
95 the file.
96
97 What: /sys/class/ptp/ptp<N>/pps_avai
98 Date: September 2010
99 Contact: Richard Cochran <richardcochran
100 Description:
101 This file indicates whether th
102 supports a Pulse Per Second to
103 "1" means that the PPS is supp
104 not supported.
105
106 What: /sys/class/ptp/ptp<N>/extts_en
107 Date: September 2010
108 Contact: Richard Cochran <richardcochran
109 Description:
110 This write-only file enables o
111 timestamps. To enable external
112 channel index followed by a "1
113 To disable external timestamps
114 index followed by a "0" into t
115
116 What: /sys/class/ptp/ptp<N>/fifo
117 Date: September 2010
118 Contact: Richard Cochran <richardcochran
119 Description:
120 This file provides timestamps
121 the form of three integers: ch
122 and nanoseconds.
123
124 What: /sys/class/ptp/ptp<N>/period
125 Date: September 2010
126 Contact: Richard Cochran <richardcochran
127 Description:
128 This write-only file enables o
129 outputs. To enable a periodic
130 integers into the file: channe
131 seconds, start time nanosecond
132 period nanoseconds. To disable
133 all the seconds and nanosecond
134
135 What: /sys/class/ptp/ptp<N>/pps_enab
136 Date: September 2010
137 Contact: Richard Cochran <richardcochran
138 Description:
139 This write-only file enables o
140 PPS events to the Linux PPS su
141 events, write a "1" into the f
142 write a "0" into the file.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.