net: ethernet: ti: cpts: switch to use new .gettimex64() interface

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The CPTS HW latches and saves CPTS counter value in CPTS fifo immediately
after writing to CPSW_CPTS_PUSH.TS_PUSH (bit 0), so the total time that the
driver needs to read the CPTS timestamp is the time required CPSW_CPTS_PUSH
write to actually reach HW.

Hence switch CPTS driver to implement new .gettimex64() callback for more
precise measurement of the offset between a PHC and the system clock which
is measured as time between
  write(CPSW_CPTS_PUSH)
  read(CPSW_CPTS_PUSH)

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Grygorii Strashko 2020-04-23 17:20:16 +03:00 • committed by David S. Miller

parent 0d6df3e613

commit 856e59ab7e

1 changed files with 14 additions and 8 deletions

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drivers/net/ethernet/ti/cpts.c

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