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Commit e4788b80 authored by Richard Cochran's avatar Richard Cochran Committed by David S. Miller
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ptp: dp83640: Use the high resolution frequency method. 



The dp83640 has a frequency resolution of about 0.029 ppb.
This patch lets users of the device benefit from the
increased frequency resolution when tuning the clock.

Signed-off-by: default avatarRichard Cochran <richardcochran@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c79e975e

drivers/net/phy/dp83640.c

+7 −7
Original line number Diff line number Diff line
@@ -375,7 +375,7 @@ static int periodic_output(struct dp83640_clock *clock, 


/* ptp clock methods */



static int ptp_dp83640_adjfreq(struct ptp_clock_info *ptp, s32 ppb)

static int ptp_dp83640_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)

{

	struct dp83640_clock *clock =

		container_of(ptp, struct dp83640_clock, caps);
@@ -384,13 +384,13 @@ static int ptp_dp83640_adjfreq(struct ptp_clock_info *ptp, s32 ppb) 
	int neg_adj = 0;

	u16 hi, lo;



	if (ppb < 0) {

	if (scaled_ppm < 0) {

		neg_adj = 1;

		ppb = -ppb;

		scaled_ppm = -scaled_ppm;

	}

	rate = ppb;

	rate <<= 26;

	rate = div_u64(rate, 1953125);

	rate = scaled_ppm;

	rate <<= 13;

	rate = div_u64(rate, 15625);



	hi = (rate >> 16) & PTP_RATE_HI_MASK;

	if (neg_adj)
@@ -1035,7 +1035,7 @@ static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus) 
	clock->caps.n_per_out	= N_PER_OUT;

	clock->caps.n_pins	= DP83640_N_PINS;

	clock->caps.pps		= 0;

	clock->caps.adjfreq	= ptp_dp83640_adjfreq;

	clock->caps.adjfine	= ptp_dp83640_adjfine;

	clock->caps.adjtime	= ptp_dp83640_adjtime;

	clock->caps.gettime64	= ptp_dp83640_gettime;

	clock->caps.settime64	= ptp_dp83640_settime;