diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index 835e6039c186..d776074b49cb 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -706,7 +706,7 @@ static int hv_ptp_settime(struct ptp_clock_info *p, const struct timespec64 *ts)
 	return -EOPNOTSUPP;
 }
 
-static int hv_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta)
+static int hv_ptp_adjfine(struct ptp_clock_info *ptp, long delta)
 {
 	return -EOPNOTSUPP;
 }
@@ -724,7 +724,7 @@ static struct ptp_clock_info ptp_hyperv_info = {
 	.name		= "hyperv",
 	.enable         = hv_ptp_enable,
 	.adjtime        = hv_ptp_adjtime,
-	.adjfreq        = hv_ptp_adjfreq,
+	.adjfine        = hv_ptp_adjfine,
 	.gettime64      = hv_ptp_gettime,
 	.settime64      = hv_ptp_settime,
 	.owner		= THIS_MODULE,
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c b/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c
index d06d260cf1e2..7051bd7cf6dc 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c
@@ -134,27 +134,15 @@ static u64 xgbe_cc_read(const struct cyclecounter *cc)
 	return nsec;
 }
 
-static int xgbe_adjfreq(struct ptp_clock_info *info, s32 delta)
+static int xgbe_adjfine(struct ptp_clock_info *info, long scaled_ppm)
 {
 	struct xgbe_prv_data *pdata = container_of(info,
 						   struct xgbe_prv_data,
 						   ptp_clock_info);
 	unsigned long flags;
-	u64 adjust;
-	u32 addend, diff;
-	unsigned int neg_adjust = 0;
+	u64 addend;
 
-	if (delta < 0) {
-		neg_adjust = 1;
-		delta = -delta;
-	}
-
-	adjust = pdata->tstamp_addend;
-	adjust *= delta;
-	diff = div_u64(adjust, 1000000000UL);
-
-	addend = (neg_adjust) ? pdata->tstamp_addend - diff :
-				pdata->tstamp_addend + diff;
+	addend = adjust_by_scaled_ppm(pdata->tstamp_addend, scaled_ppm);
 
 	spin_lock_irqsave(&pdata->tstamp_lock, flags);
 
@@ -235,7 +223,7 @@ void xgbe_ptp_register(struct xgbe_prv_data *pdata)
 		 netdev_name(pdata->netdev));
 	info->owner = THIS_MODULE;
 	info->max_adj = pdata->ptpclk_rate;
-	info->adjfreq = xgbe_adjfreq;
+	info->adjfine = xgbe_adjfine;
 	info->adjtime = xgbe_adjtime;
 	info->gettime64 = xgbe_gettime;
 	info->settime64 = xgbe_settime;
diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c
index 0e488e4fa5c1..6e5a1720e6cd 100644
--- a/drivers/net/ethernet/intel/e1000e/ptp.c
+++ b/drivers/net/ethernet/intel/e1000e/ptp.c
@@ -29,17 +29,11 @@ static int e1000e_phc_adjfine(struct ptp_clock_info *ptp, long delta)
 	struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
 						     ptp_clock_info);
 	struct e1000_hw *hw = &adapter->hw;
-	bool neg_adj = false;
 	unsigned long flags;
-	u64 adjustment;
-	u32 timinca, incvalue;
+	u64 incvalue;
+	u32 timinca;
 	s32 ret_val;
 
-	if (delta < 0) {
-		neg_adj = true;
-		delta = -delta;
-	}
-
 	/* Get the System Time Register SYSTIM base frequency */
 	ret_val = e1000e_get_base_timinca(adapter, &timinca);
 	if (ret_val)
@@ -48,11 +42,7 @@ static int e1000e_phc_adjfine(struct ptp_clock_info *ptp, long delta)
 	spin_lock_irqsave(&adapter->systim_lock, flags);
 
 	incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK;
-
-	adjustment = mul_u64_u64_div_u64(incvalue, (u64)delta,
-					 1000000ULL << 16);
-
-	incvalue = neg_adj ? (incvalue - adjustment) : (incvalue + adjustment);
+	incvalue = adjust_by_scaled_ppm(incvalue, delta);
 
 	timinca &= ~E1000_TIMINCA_INCVALUE_MASK;
 	timinca |= incvalue;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ptp.c b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
index ffea0c9c82f1..c37abbb3cd06 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ptp.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
@@ -347,23 +347,12 @@ static int i40e_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 {
 	struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
 	struct i40e_hw *hw = &pf->hw;
-	u64 adj, freq, diff;
-	int neg_adj = 0;
-
-	if (scaled_ppm < 0) {
-		neg_adj = 1;
-		scaled_ppm = -scaled_ppm;
-	}
+	u64 adj, base_adj;
 
 	smp_mb(); /* Force any pending update before accessing. */
-	freq = I40E_PTP_40GB_INCVAL * READ_ONCE(pf->ptp_adj_mult);
-	diff = mul_u64_u64_div_u64(freq, (u64)scaled_ppm,
-				   1000000ULL << 16);
+	base_adj = I40E_PTP_40GB_INCVAL * READ_ONCE(pf->ptp_adj_mult);
 
-	if (neg_adj)
-		adj = I40E_PTP_40GB_INCVAL - diff;
-	else
-		adj = I40E_PTP_40GB_INCVAL + diff;
+	adj = adjust_by_scaled_ppm(base_adj, scaled_ppm);
 
 	wr32(hw, I40E_PRTTSYN_INC_L, adj & 0xFFFFFFFF);
 	wr32(hw, I40E_PRTTSYN_INC_H, adj >> 32);
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 011b727ab190..5cf198a33e26 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1444,24 +1444,10 @@ static int ice_ptp_adjfine(struct ptp_clock_info *info, long scaled_ppm)
 {
 	struct ice_pf *pf = ptp_info_to_pf(info);
 	struct ice_hw *hw = &pf->hw;
-	u64 incval, diff;
-	int neg_adj = 0;
+	u64 incval;
 	int err;
 
-	incval = ice_base_incval(pf);
-
-	if (scaled_ppm < 0) {
-		neg_adj = 1;
-		scaled_ppm = -scaled_ppm;
-	}
-
-	diff = mul_u64_u64_div_u64(incval, (u64)scaled_ppm,
-				   1000000ULL << 16);
-	if (neg_adj)
-		incval -= diff;
-	else
-		incval += diff;
-
+	incval = adjust_by_scaled_ppm(ice_base_incval(pf), scaled_ppm);
 	err = ice_ptp_write_incval_locked(hw, incval);
 	if (err) {
 		dev_err(ice_pf_to_dev(pf), "PTP failed to set incval, err %d\n",
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 15e57460e19e..6f471b91f562 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -195,23 +195,9 @@ static int igb_ptp_adjfine_82576(struct ptp_clock_info *ptp, long scaled_ppm)
 	struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 					       ptp_caps);
 	struct e1000_hw *hw = &igb->hw;
-	int neg_adj = 0;
-	u64 rate;
-	u32 incvalue;
+	u64 incvalue;
 
-	if (scaled_ppm < 0) {
-		neg_adj = 1;
-		scaled_ppm = -scaled_ppm;
-	}
-
-	incvalue = INCVALUE_82576;
-	rate = mul_u64_u64_div_u64(incvalue, (u64)scaled_ppm,
-				   1000000ULL << 16);
-
-	if (neg_adj)
-		incvalue -= rate;
-	else
-		incvalue += rate;
+	incvalue = adjust_by_scaled_ppm(INCVALUE_82576, scaled_ppm);
 
 	wr32(E1000_TIMINCA, INCPERIOD_82576 | (incvalue & INCVALUE_82576_MASK));
 
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
index f8605f57bd06..fd3f77a9e28d 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
@@ -451,21 +451,11 @@ static int ixgbe_ptp_adjfine_82599(struct ptp_clock_info *ptp, long scaled_ppm)
 	struct ixgbe_adapter *adapter =
 		container_of(ptp, struct ixgbe_adapter, ptp_caps);
 	struct ixgbe_hw *hw = &adapter->hw;
-	u64 incval, diff;
-	int neg_adj = 0;
-
-	if (scaled_ppm < 0) {
-		neg_adj = 1;
-		scaled_ppm = -scaled_ppm;
-	}
+	u64 incval;
 
 	smp_mb();
 	incval = READ_ONCE(adapter->base_incval);
-
-	diff = mul_u64_u64_div_u64(incval, scaled_ppm,
-				   1000000ULL << 16);
-
-	incval = neg_adj ? (incval - diff) : (incval + diff);
+	incval = adjust_by_scaled_ppm(incval, scaled_ppm);
 
 	switch (hw->mac.type) {
 	case ixgbe_mac_X540:
@@ -502,17 +492,11 @@ static int ixgbe_ptp_adjfine_X550(struct ptp_clock_info *ptp, long scaled_ppm)
 	struct ixgbe_adapter *adapter =
 			container_of(ptp, struct ixgbe_adapter, ptp_caps);
 	struct ixgbe_hw *hw = &adapter->hw;
-	int neg_adj = 0;
+	bool neg_adj;
 	u64 rate;
 	u32 inca;
 
-	if (scaled_ppm < 0) {
-		neg_adj = 1;
-		scaled_ppm = -scaled_ppm;
-	}
-
-	rate = mul_u64_u64_div_u64(IXGBE_X550_BASE_PERIOD, scaled_ppm,
-				   1000000ULL << 16);
+	neg_adj = diff_by_scaled_ppm(IXGBE_X550_BASE_PERIOD, scaled_ppm, &rate);
 
 	/* warn if rate is too large */
 	if (rate >= INCVALUE_MASK)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
index 024788549c25..98b5ffb4d729 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
@@ -111,34 +111,27 @@ void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev)
 }
 
 /**
- * mlx4_en_phc_adjfreq - adjust the frequency of the hardware clock
+ * mlx4_en_phc_adjfine - adjust the frequency of the hardware clock
  * @ptp: ptp clock structure
- * @delta: Desired frequency change in parts per billion
+ * @scaled_ppm: Desired frequency change in scaled parts per million
  *
- * Adjust the frequency of the PHC cycle counter by the indicated delta from
- * the base frequency.
+ * Adjust the frequency of the PHC cycle counter by the indicated scaled_ppm
+ * from the base frequency.
+ *
+ * Scaled parts per million is ppm with a 16-bit binary fractional field.
  **/
-static int mlx4_en_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)
+static int mlx4_en_phc_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 {
-	u64 adj;
-	u32 diff, mult;
-	int neg_adj = 0;
+	u32 mult;
 	unsigned long flags;
 	struct mlx4_en_dev *mdev = container_of(ptp, struct mlx4_en_dev,
 						ptp_clock_info);
 
-	if (delta < 0) {
-		neg_adj = 1;
-		delta = -delta;
-	}
-	mult = mdev->nominal_c_mult;
-	adj = mult;
-	adj *= delta;
-	diff = div_u64(adj, 1000000000ULL);
+	mult = (u32)adjust_by_scaled_ppm(mdev->nominal_c_mult, scaled_ppm);
 
 	write_seqlock_irqsave(&mdev->clock_lock, flags);
 	timecounter_read(&mdev->clock);
-	mdev->cycles.mult = neg_adj ? mult - diff : mult + diff;
+	mdev->cycles.mult = mult;
 	write_sequnlock_irqrestore(&mdev->clock_lock, flags);
 
 	return 0;
@@ -237,7 +230,7 @@ static const struct ptp_clock_info mlx4_en_ptp_clock_info = {
 	.n_per_out	= 0,
 	.n_pins		= 0,
 	.pps		= 0,
-	.adjfreq	= mlx4_en_phc_adjfreq,
+	.adjfine	= mlx4_en_phc_adjfine,
 	.adjtime	= mlx4_en_phc_adjtime,
 	.gettime64	= mlx4_en_phc_gettime,
 	.settime64	= mlx4_en_phc_settime,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index d3a9ae80fd30..69cfe60c558a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -339,35 +339,25 @@ static int mlx5_ptp_adjfreq_real_time(struct mlx5_core_dev *mdev, s32 freq)
 	return mlx5_set_mtutc(mdev, in, sizeof(in));
 }
 
-static int mlx5_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta)
+static int mlx5_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 {
 	struct mlx5_clock *clock = container_of(ptp, struct mlx5_clock, ptp_info);
 	struct mlx5_timer *timer = &clock->timer;
 	struct mlx5_core_dev *mdev;
 	unsigned long flags;
-	int neg_adj = 0;
-	u32 diff;
-	u64 adj;
+	u32 mult;
 	int err;
 
 	mdev = container_of(clock, struct mlx5_core_dev, clock);
-	err = mlx5_ptp_adjfreq_real_time(mdev, delta);
+	err = mlx5_ptp_adjfreq_real_time(mdev, scaled_ppm_to_ppb(scaled_ppm));
 	if (err)
 		return err;
 
-	if (delta < 0) {
-		neg_adj = 1;
-		delta = -delta;
-	}
-
-	adj = timer->nominal_c_mult;
-	adj *= delta;
-	diff = div_u64(adj, 1000000000ULL);
+	mult = (u32)adjust_by_scaled_ppm(timer->nominal_c_mult, scaled_ppm);
 
 	write_seqlock_irqsave(&clock->lock, flags);
 	timecounter_read(&timer->tc);
-	timer->cycles.mult = neg_adj ? timer->nominal_c_mult - diff :
-				       timer->nominal_c_mult + diff;
+	timer->cycles.mult = mult;
 	mlx5_update_clock_info_page(mdev);
 	write_sequnlock_irqrestore(&clock->lock, flags);
 
@@ -697,7 +687,7 @@ static const struct ptp_clock_info mlx5_ptp_clock_info = {
 	.n_per_out	= 0,
 	.n_pins		= 0,
 	.pps		= 0,
-	.adjfreq	= mlx5_ptp_adjfreq,
+	.adjfine	= mlx5_ptp_adjfine,
 	.adjtime	= mlx5_ptp_adjtime,
 	.gettimex64	= mlx5_ptp_gettimex,
 	.settime64	= mlx5_ptp_settime,
diff --git a/drivers/net/ethernet/microchip/lan743x_ptp.c b/drivers/net/ethernet/microchip/lan743x_ptp.c
index da3ea905adbb..39e1066ecd5f 100644
--- a/drivers/net/ethernet/microchip/lan743x_ptp.c
+++ b/drivers/net/ethernet/microchip/lan743x_ptp.c
@@ -339,59 +339,18 @@ static int lan743x_ptpci_adjfine(struct ptp_clock_info *ptpci, long scaled_ppm)
 	struct lan743x_adapter *adapter =
 		container_of(ptp, struct lan743x_adapter, ptp);
 	u32 lan743x_rate_adj = 0;
-	bool positive = true;
-	u64 u64_delta = 0;
+	u64 u64_delta;
 
 	if ((scaled_ppm < (-LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM)) ||
 	    scaled_ppm > LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM) {
 		return -EINVAL;
 	}
-	if (scaled_ppm > 0) {
-		u64_delta = (u64)scaled_ppm;
-		positive = true;
-	} else {
-		u64_delta = (u64)(-scaled_ppm);
-		positive = false;
-	}
-	u64_delta = (u64_delta << 19);
-	lan743x_rate_adj = div_u64(u64_delta, 1000000);
 
-	if (positive)
-		lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;
-
-	lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
-			  lan743x_rate_adj);
-
-	return 0;
-}
-
-static int lan743x_ptpci_adjfreq(struct ptp_clock_info *ptpci, s32 delta_ppb)
-{
-	struct lan743x_ptp *ptp =
-		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
-	struct lan743x_adapter *adapter =
-		container_of(ptp, struct lan743x_adapter, ptp);
-	u32 lan743x_rate_adj = 0;
-	bool positive = true;
-	u32 u32_delta = 0;
-	u64 u64_delta = 0;
-
-	if ((delta_ppb < (-LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB)) ||
-	    delta_ppb > LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB) {
-		return -EINVAL;
-	}
-	if (delta_ppb > 0) {
-		u32_delta = (u32)delta_ppb;
-		positive = true;
-	} else {
-		u32_delta = (u32)(-delta_ppb);
-		positive = false;
-	}
-	u64_delta = (((u64)u32_delta) << 35);
-	lan743x_rate_adj = div_u64(u64_delta, 1000000000);
-
-	if (positive)
-		lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;
+	/* diff_by_scaled_ppm returns true if the difference is negative */
+	if (diff_by_scaled_ppm(1ULL << 35, scaled_ppm, &u64_delta))
+		lan743x_rate_adj = (u32)u64_delta;
+	else
+		lan743x_rate_adj = (u32)u64_delta | PTP_CLOCK_RATE_ADJ_DIR_;
 
 	lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
 			  lan743x_rate_adj);
@@ -1583,7 +1542,6 @@ int lan743x_ptp_open(struct lan743x_adapter *adapter)
 	ptp->ptp_clock_info.pps = LAN743X_PTP_N_PPS;
 	ptp->ptp_clock_info.pin_config = ptp->pin_config;
 	ptp->ptp_clock_info.adjfine = lan743x_ptpci_adjfine;
-	ptp->ptp_clock_info.adjfreq = lan743x_ptpci_adjfreq;
 	ptp->ptp_clock_info.adjtime = lan743x_ptpci_adjtime;
 	ptp->ptp_clock_info.gettime64 = lan743x_ptpci_gettime64;
 	ptp->ptp_clock_info.getcrosststamp = NULL;
diff --git a/drivers/net/ethernet/renesas/ravb_ptp.c b/drivers/net/ethernet/renesas/ravb_ptp.c
index 87c4306d66ec..6e4ef7af27bf 100644
--- a/drivers/net/ethernet/renesas/ravb_ptp.c
+++ b/drivers/net/ethernet/renesas/ravb_ptp.c
@@ -88,24 +88,17 @@ static int ravb_ptp_update_compare(struct ravb_private *priv, u32 ns)
 }
 
 /* PTP clock operations */
-static int ravb_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+static int ravb_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 {
 	struct ravb_private *priv = container_of(ptp, struct ravb_private,
 						 ptp.info);
 	struct net_device *ndev = priv->ndev;
 	unsigned long flags;
-	u32 diff, addend;
-	bool neg_adj = false;
+	u32 addend;
 	u32 gccr;
 
-	if (ppb < 0) {
-		neg_adj = true;
-		ppb = -ppb;
-	}
-	addend = priv->ptp.default_addend;
-	diff = div_u64((u64)addend * ppb, NSEC_PER_SEC);
-
-	addend = neg_adj ? addend - diff : addend + diff;
+	addend = (u32)adjust_by_scaled_ppm(priv->ptp.default_addend,
+					   scaled_ppm);
 
 	spin_lock_irqsave(&priv->lock, flags);
 
@@ -295,7 +288,7 @@ static const struct ptp_clock_info ravb_ptp_info = {
 	.max_adj	= 50000000,
 	.n_ext_ts	= N_EXT_TS,
 	.n_per_out	= N_PER_OUT,
-	.adjfreq	= ravb_ptp_adjfreq,
+	.adjfine	= ravb_ptp_adjfine,
 	.adjtime	= ravb_ptp_adjtime,
 	.gettime64	= ravb_ptp_gettime64,
 	.settime64	= ravb_ptp_settime64,
diff --git a/drivers/ptp/ptp_kvm_common.c b/drivers/ptp/ptp_kvm_common.c
index fcae32f56f25..9141162c4237 100644
--- a/drivers/ptp/ptp_kvm_common.c
+++ b/drivers/ptp/ptp_kvm_common.c
@@ -66,7 +66,7 @@ static int ptp_kvm_getcrosststamp(struct ptp_clock_info *ptp,
  * PTP clock operations
  */
 
-static int ptp_kvm_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+static int ptp_kvm_adjfine(struct ptp_clock_info *ptp, long delta)
 {
 	return -EOPNOTSUPP;
 }
@@ -115,7 +115,7 @@ static const struct ptp_clock_info ptp_kvm_caps = {
 	.n_ext_ts	= 0,
 	.n_pins		= 0,
 	.pps		= 0,
-	.adjfreq	= ptp_kvm_adjfreq,
+	.adjfine	= ptp_kvm_adjfine,
 	.adjtime	= ptp_kvm_adjtime,
 	.gettime64	= ptp_kvm_gettime,
 	.settime64	= ptp_kvm_settime,
diff --git a/drivers/ptp/ptp_vmw.c b/drivers/ptp/ptp_vmw.c
index 5dca26e14bdc..d64eec5b1788 100644
--- a/drivers/ptp/ptp_vmw.c
+++ b/drivers/ptp/ptp_vmw.c
@@ -47,7 +47,7 @@ static int ptp_vmw_adjtime(struct ptp_clock_info *info, s64 delta)
 	return -EOPNOTSUPP;
 }
 
-static int ptp_vmw_adjfreq(struct ptp_clock_info *info, s32 delta)
+static int ptp_vmw_adjfine(struct ptp_clock_info *info, long delta)
 {
 	return -EOPNOTSUPP;
 }
@@ -79,7 +79,7 @@ static struct ptp_clock_info ptp_vmw_clock_info = {
 	.name		= "ptp_vmw",
 	.max_adj	= 0,
 	.adjtime	= ptp_vmw_adjtime,
-	.adjfreq	= ptp_vmw_adjfreq,
+	.adjfine	= ptp_vmw_adjfine,
 	.gettime64	= ptp_vmw_gettime,
 	.settime64	= ptp_vmw_settime,
 	.enable		= ptp_vmw_enable,
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 92b44161408e..f4781c5766d6 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -45,6 +45,8 @@ struct system_device_crosststamp;
 
 /**
  * struct ptp_system_timestamp - system time corresponding to a PHC timestamp
+ * @pre_ts: system timestamp before capturing PHC
+ * @post_ts: system timestamp after capturing PHC
  */
 struct ptp_system_timestamp {
 	struct timespec64 pre_ts;
@@ -246,6 +248,52 @@ static inline long scaled_ppm_to_ppb(long ppm)
 	return (long)ppb;
 }
 
+/**
+ * diff_by_scaled_ppm - Calculate difference using scaled ppm
+ * @base: the base increment value to adjust
+ * @scaled_ppm: scaled parts per million to adjust by
+ * @diff: on return, the absolute value of calculated diff
+ *
+ * Calculate the difference to adjust the base increment using scaled parts
+ * per million.
+ *
+ * Use mul_u64_u64_div_u64 to perform the difference calculation in avoid
+ * possible overflow.
+ *
+ * Returns: true if scaled_ppm is negative, false otherwise
+ */
+static inline bool diff_by_scaled_ppm(u64 base, long scaled_ppm, u64 *diff)
+{
+	bool negative = false;
+
+	if (scaled_ppm < 0) {
+		negative = true;
+		scaled_ppm = -scaled_ppm;
+	}
+
+	*diff = mul_u64_u64_div_u64(base, (u64)scaled_ppm, 1000000ULL << 16);
+
+	return negative;
+}
+
+/**
+ * adjust_by_scaled_ppm - Adjust a base increment by scaled parts per million
+ * @base: the base increment value to adjust
+ * @scaled_ppm: scaled parts per million frequency adjustment
+ *
+ * Helper function which calculates a new increment value based on the
+ * requested scaled parts per million adjustment.
+ */
+static inline u64 adjust_by_scaled_ppm(u64 base, long scaled_ppm)
+{
+	u64 diff;
+
+	if (diff_by_scaled_ppm(base, scaled_ppm, &diff))
+		return base - diff;
+
+	return base + diff;
+}
+
 #if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
 
 /**
@@ -316,6 +364,11 @@ int ptp_find_pin(struct ptp_clock *ptp,
  * should most likely call ptp_find_pin() directly from their
  * ptp_clock_info::enable() method.
  *
+* @ptp:    The clock obtained from ptp_clock_register().
+* @func:   One of the ptp_pin_function enumerated values.
+* @chan:   The particular functional channel to find.
+* Return:  Pin index in the range of zero to ptp_clock_caps.n_pins - 1,
+*          or -1 if the auxiliary function cannot be found.
  */
 
 int ptp_find_pin_unlocked(struct ptp_clock *ptp,