This patch adds the ptp_caps structure, ptp api implementation,
reference clock read and register/unregister functions. All the basic
clock operations as described in Documentation/ptp/ptp.txt are
supported.
Frequency adjustment is performed using hardware with a 24 bit
accumulator and a programmable correction value. On each clk, the
correction value gets added to the accumulator and when it overflows,
the time counter is incremented/decremented and the accumulator reset.
So conversion from ppb to correction value is
ppb * (1 << 24) / 1000000000
[Re-organized to put the ptp_clock_info struct declaration in one patch,
added ptp_clock_info.name, and added locking to tg3_ptp_adjtime() based
on input from Richard Cochran.]
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7d41e49ac2