What:  /sys/class/pps/
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ directory will contain files and
  directories that will provide a unified interface to
  the PPS sources.

What:  /sys/class/pps/ppsX/
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ppsX/ directory is related to X-th
  PPS source into the system. Each directory will
  contain files to manage and control its PPS source.

What:  /sys/class/pps/ppsX/assert
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ppsX/assert file reports the assert events
  and the assert sequence number of the X-th source in the form:

   <secs>.<nsec>#<sequence>

  If the source has no assert events the content of this file
  is empty.

What:  /sys/class/pps/ppsX/clear
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ppsX/clear file reports the clear events
  and the clear sequence number of the X-th source in the form:

   <secs>.<nsec>#<sequence>

  If the source has no clear events the content of this file
  is empty.

What:  /sys/class/pps/ppsX/mode
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ppsX/mode file reports the functioning
  mode of the X-th source in hexadecimal encoding.

  Please, refer to linux/include/linux/pps.h for further
  info.

What:  /sys/class/pps/ppsX/echo
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ppsX/echo file reports if the X-th does
  or does not support an "echo" function.

What:  /sys/class/pps/ppsX/name
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ppsX/name file reports the name of the
  X-th source.

What:  /sys/class/pps/ppsX/path
Date:  February 2008
Contact: Rodolfo Giometti <giometti@linux.it>
Description:
  The /sys/class/pps/ppsX/path file reports the path name of
  the device connected with the X-th source.

  If the source is not connected with any device the content
  of this file is empty.