Hello
under a ptp  capablities that only external time stamp channels support, 
can we have a work around to get pps out?
Is there any one can give me an explaination about the capabilities? What does 
external time stamp channels mean? And what the 15 programmable pins are used 
for?  

 ./testptp -d /dev/ptp1  -c       
 
capabilities:
 
  1000000 maximum frequency adjustment (ppb)
 
  0 programmable alarms
 
  1 external time stamp channels
 
  0 programmable periodic signals
 
  0 pulse per second
 
  15 programmable pins
 
  0 cross timestamping
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