diff options
| author |   Richard Cochran <richardcochran@gmail.com> | 2016-11-08 22:49:18 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-11-09 21:19:53 -0500 |
| commit | e4788b800f66718f0736bca385da548e48d39b8e (patch) | |
| tree | 51ea5a0c4efcccf7549a221241ef37a6d84329af | |
| parent | ptp: igb: Use the high resolution frequency method. (diff) | |
| download | linux-dev-e4788b800f66718f0736bca385da548e48d39b8e.tar.xz linux-dev-e4788b800f66718f0736bca385da548e48d39b8e.zip | |
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: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/phy/dp83640.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c index 7a240fce3a7e..e2460a57e4b1 100644 --- a/drivers/net/phy/dp83640.c +++ b/drivers/net/phy/dp83640.c @@ -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; |