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ptp: Add adjphase function to support phase offset control. 

Adds adjust phase function to take advantage of a PHC
clock's hardware filtering capability that uses phase offset
control word instead of frequency offset control word.

Signed-off-by: Vincent Cheng <vincent.cheng.xh@renesas.com>
Reviewed-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vincent Cheng 2020-05-01 23:35:36 -04:00 committed by David S. Miller
parent 115506fea4
commit 184ecc9eb2
2 changed files with 8 additions and 1 deletions
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3
drivers/ptp/ptp_clock.c
View File

@ -146,6 +146,9 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
else
err = ops->adjfreq(ops, ppb);
ptp->dialed_frequency = tx->freq;
} else if (tx->modes & ADJ_OFFSET) {
if (ops->adjphase)
err = ops->adjphase(ops, tx->offset);
} else if (tx->modes == 0) {
tx->freq = ptp->dialed_frequency;
err = 0;

6
include/linux/ptp_clock_kernel.h
View File

@ -36,7 +36,7 @@ struct ptp_system_timestamp {
};
/**
* struct ptp_clock_info - decribes a PTP hardware clock
* struct ptp_clock_info - describes a PTP hardware clock
*
* @owner: The clock driver should set to THIS_MODULE.
* @name: A short "friendly name" to identify the clock and to
@ -65,6 +65,9 @@ struct ptp_system_timestamp {
* parameter delta: Desired frequency offset from nominal frequency
* in parts per billion
*
* @adjphase: Adjusts the phase offset of the hardware clock.
* parameter delta: Desired change in nanoseconds.
*
* @adjtime: Shifts the time of the hardware clock.
* parameter delta: Desired change in nanoseconds.
*
@ -128,6 +131,7 @@ struct ptp_clock_info {
struct ptp_pin_desc *pin_config;
int (*adjfine)(struct ptp_clock_info *ptp, long scaled_ppm);
int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
int (*adjphase)(struct ptp_clock_info *ptp, s32 phase);
int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
int (*gettimex64)(struct ptp_clock_info *ptp, struct timespec64 *ts,