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-What: /sys/class/ptp/
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This directory contains files and directories
- providing a standardized interface to the ancillary
- features of PTP hardware clocks.
-
-What: /sys/class/ptp/ptpN/
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This directory contains the attributes of the Nth PTP
- hardware clock registered into the PTP class driver
- subsystem.
-
-What: /sys/class/ptp/ptpN/clock_name
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This file contains the name of the PTP hardware clock
- as a human readable string.
-
-What: /sys/class/ptp/ptpN/max_adjustment
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This file contains the PTP hardware clock's maximum
- frequency adjustment value (a positive integer) in
- parts per billion.
-
-What: /sys/class/ptp/ptpN/n_alarms
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This file contains the number of periodic or one shot
- alarms offer by the PTP hardware clock.
-
-What: /sys/class/ptp/ptpN/n_external_timestamps
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This file contains the number of external timestamp
- channels offered by the PTP hardware clock.
-
-What: /sys/class/ptp/ptpN/n_periodic_outputs
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This file contains the number of programmable periodic
- output channels offered by the PTP hardware clock.
-
-What: /sys/class/ptp/ptpN/pps_avaiable
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This file indicates whether the PTP hardware clock
- supports a Pulse Per Second to the host CPU. Reading
- "1" means that the PPS is supported, while "0" means
- not supported.
-
-What: /sys/class/ptp/ptpN/extts_enable
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This write-only file enables or disables external
- timestamps. To enable external timestamps, write the
- channel index followed by a "1" into the file.
- To disable external timestamps, write the channel
- index followed by a "0" into the file.
-
-What: /sys/class/ptp/ptpN/fifo
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This file provides timestamps on external events, in
- the form of three integers: channel index, seconds,
- and nanoseconds.
-
-What: /sys/class/ptp/ptpN/period
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This write-only file enables or disables periodic
- outputs. To enable a periodic output, write five
- integers into the file: channel index, start time
- seconds, start time nanoseconds, period seconds, and
- period nanoseconds. To disable a periodic output, set
- all the seconds and nanoseconds values to zero.
-
-What: /sys/class/ptp/ptpN/pps_enable
-Date: September 2010
-Contact: Richard Cochran <richardcochran@gmail.com>
-Description:
- This write-only file enables or disables delivery of
- PPS events to the Linux PPS subsystem. To enable PPS
- events, write a "1" into the file. To disable events,
- write a "0" into the file.