WIP: Add timekeeping routines, clock sync and adjtimex

Ulrich Huberrequested to merge
feature/ptpd into next

Introduces a software clock to the FreeRTOS kernel, clock synchronization of internal clocks and hardware-independent adjtimex routines

Missing features:

  • ktime_get must take into account that TSU is not available
  • ktime_get_seconds must take into account that TSU is not available
Edited by Ulrich Huber

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