143 lines
4.9 KiB
Plaintext
143 lines
4.9 KiB
Plaintext
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/ptp<N>/
|
|
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/ptp<N>/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. The purpose of this
|
|
attribute is to provide the user with a "friendly
|
|
name" and to help distinguish PHY based devices from
|
|
MAC based ones. The string does not necessarily have
|
|
to be any kind of unique id.
|
|
|
|
What: /sys/class/ptp/ptp<N>/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/ptp<N>/max_vclocks
|
|
Date: May 2021
|
|
Contact: Yangbo Lu <yangbo.lu@nxp.com>
|
|
Description:
|
|
This file contains the maximum number of ptp vclocks.
|
|
Write integer to re-configure it.
|
|
|
|
What: /sys/class/ptp/ptp<N>/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/ptp<N>/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/ptp<N>/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/ptp<N>/n_pins
|
|
Date: March 2014
|
|
Contact: Richard Cochran <richardcochran@gmail.com>
|
|
Description:
|
|
This file contains the number of programmable pins
|
|
offered by the PTP hardware clock.
|
|
|
|
What: /sys/class/ptp/ptp<N>/n_vclocks
|
|
Date: May 2021
|
|
Contact: Yangbo Lu <yangbo.lu@nxp.com>
|
|
Description:
|
|
This file contains the number of virtual PTP clocks in
|
|
use. By default, the value is 0 meaning that only the
|
|
physical clock is in use. Setting the value creates
|
|
the corresponding number of virtual clocks and causes
|
|
the physical clock to become free running. Setting the
|
|
value back to 0 deletes the virtual clocks and
|
|
switches the physical clock back to normal, adjustable
|
|
operation.
|
|
|
|
What: /sys/class/ptp/ptp<N>/pins
|
|
Date: March 2014
|
|
Contact: Richard Cochran <richardcochran@gmail.com>
|
|
Description:
|
|
This directory contains one file for each programmable
|
|
pin offered by the PTP hardware clock. The file name
|
|
is the hardware dependent pin name. Reading from this
|
|
file produces two numbers, the assigned function (see
|
|
the `PTP_PF_` enumeration values in linux/ptp_clock.h)
|
|
and the channel number. The function and channel
|
|
assignment may be changed by two writing numbers into
|
|
the file.
|
|
|
|
What: /sys/class/ptp/ptp<N>/pps_available
|
|
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/ptp<N>/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/ptp<N>/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/ptp<N>/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/ptp<N>/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.
|