ptp_ixp46x: convert .adjfreq to .adjfine

The ptp_ixp46x implementation of .adjfreq is implemented in terms of a
straight forward "base * ppb / 1 billion" calculation.

Convert this to the newer .adjfine, using the recently added
adjust_by_scaled_ppm helper function.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/xscale/ptp_ixp46x.c b/drivers/net/ethernet/xscale/ptp_ixp46x.c
index 9abbdb7..94203eb 100644 (file)
--- a/drivers/net/ethernet/xscale/ptp_ixp46x.c
+++ b/drivers/net/ethernet/xscale/ptp_ixp46x.c
@@ -120,24 +120,13 @@ static irqreturn_t isr(int irq, void *priv)
  * PTP clock operations
  */
 
-static int ptp_ixp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+static int ptp_ixp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 {
-       u64 adj;
-       u32 diff, addend;
-       int neg_adj = 0;
+       u32 addend;
        struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps);
        struct ixp46x_ts_regs *regs = ixp_clock->regs;
 
-       if (ppb < 0) {
-               neg_adj = 1;
-               ppb = -ppb;
-       }
-       addend = DEFAULT_ADDEND;
-       adj = addend;
-       adj *= ppb;
-       diff = div_u64(adj, 1000000000ULL);
-
-       addend = neg_adj ? addend - diff : addend + diff;
+       addend = adjust_by_scaled_ppm(DEFAULT_ADDEND, scaled_ppm);
 
        __raw_writel(addend, &regs->addend);
 
@@ -230,7 +219,7 @@ static const struct ptp_clock_info ptp_ixp_caps = {
        .n_ext_ts       = N_EXT_TS,
        .n_pins         = 0,
        .pps            = 0,
-       .adjfreq        = ptp_ixp_adjfreq,
+       .adjfine        = ptp_ixp_adjfine,
        .adjtime        = ptp_ixp_adjtime,
        .gettime64      = ptp_ixp_gettime,
        .settime64      = ptp_ixp_settime,