netdev - [PATCH net-next 3/3] ptp: dp83640: Use the high resolution frequency method.

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Date:   Tue,  8 Nov 2016 22:49:18 +0100
From:   Richard Cochran <richardcochran@...il.com>
To:     <netdev@...r.kernel.org>
Cc:     David Miller <davem@...emloft.net>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        John Stultz <john.stultz@...aro.org>,
        Manfred Rudigier <Manfred.Rudigier@...cron.at>,
        Stefan Sørensen 
        <stefan.sorensen@...ctralink.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ulrik De Bie <ulrik.debie-os@...ig.org>,
        intel-wired-lan@...ts.osuosl.org
Subject: [PATCH net-next 3/3] 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@...il.com>
---
 drivers/net/phy/dp83640.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 7a240fc..e2460a5 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;
-- 
2.1.4