Commit 184ecc9e authored by Vincent Cheng's avatar Vincent Cheng Committed by David S. Miller
Browse files

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: default avatarVincent Cheng <vincent.cheng.xh@renesas.com>
Reviewed-by: default avatarRichard Cochran <richardcochran@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 115506fe

drivers/ptp/ptp_clock.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/ptp_clock_kernel.h

+5 −1
Original line number Diff line number Diff line
@@ -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,

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