Merge branch 'add-hwtstamp_get-callback-to-phy-drivers'

Vadim Fedorenko says:

====================
add hwtstamp_get callback to phy drivers

PHY drivers are able to configure HW time stamping and are not able to
report configuration back to user space. Add callback to report
configuration like it's done for net_device and add implementation to
the drivers.
====================

Link: https://patch.msgid.link/20251124181151.277256-1-vadim.fedorenko@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

12 files changed, 139 insertions, 51 deletions

diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index 4f6cc6cd1f03..8f46e9be76b1 100644
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -2657,7 +2657,7 @@ static int gbe_hwtstamp_set(void *intf_priv, struct kernel_hwtstamp_config *cfg,
 
 	phy = gbe_intf->slave->phy;
 	if (phy_has_hwtstamp(phy))
-		return phy->mii_ts->hwtstamp(phy->mii_ts, cfg, extack);
+		return phy->mii_ts->hwtstamp_set(phy->mii_ts, cfg, extack);
 
 	switch (cfg->tx_type) {
 	case HWTSTAMP_TX_OFF:
diff --git a/drivers/net/phy/bcm-phy-ptp.c b/drivers/net/phy/bcm-phy-ptp.c
index d3501f8487d9..65d609ed69fb 100644
--- a/drivers/net/phy/bcm-phy-ptp.c
+++ b/drivers/net/phy/bcm-phy-ptp.c
@@ -780,9 +780,21 @@ out:
 	kfree_skb(skb);
 }
 
-static int bcm_ptp_hwtstamp(struct mii_timestamper *mii_ts,
-			    struct kernel_hwtstamp_config *cfg,
-			    struct netlink_ext_ack *extack)
+static int bcm_ptp_hwtstamp_get(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg)
+{
+	struct bcm_ptp_private *priv = mii2priv(mii_ts);
+
+	cfg->rx_filter = priv->hwts_rx ? HWTSTAMP_FILTER_PTP_V2_EVENT
+				       : HWTSTAMP_FILTER_NONE;
+	cfg->tx_type = priv->tx_type;
+
+	return 0;
+}
+
+static int bcm_ptp_hwtstamp_set(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg,
+				struct netlink_ext_ack *extack)
 {
 	struct bcm_ptp_private *priv = mii2priv(mii_ts);
 	u16 mode, ctrl;
@@ -898,7 +910,8 @@ static void bcm_ptp_init(struct bcm_ptp_private *priv)
 
 	priv->mii_ts.rxtstamp = bcm_ptp_rxtstamp;
 	priv->mii_ts.txtstamp = bcm_ptp_txtstamp;
-	priv->mii_ts.hwtstamp = bcm_ptp_hwtstamp;
+	priv->mii_ts.hwtstamp_set = bcm_ptp_hwtstamp_set;
+	priv->mii_ts.hwtstamp_get = bcm_ptp_hwtstamp_get;
 	priv->mii_ts.ts_info = bcm_ptp_ts_info;
 
 	priv->phydev->mii_ts = &priv->mii_ts;
diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 74396453f5bb..b950acc9c49b 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -1176,9 +1176,21 @@ static irqreturn_t dp83640_handle_interrupt(struct phy_device *phydev)
 	return IRQ_HANDLED;
 }
 
-static int dp83640_hwtstamp(struct mii_timestamper *mii_ts,
-			    struct kernel_hwtstamp_config *cfg,
-			    struct netlink_ext_ack *extack)
+static int dp83640_hwtstamp_get(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg)
+{
+	struct dp83640_private *dp83640 =
+		container_of(mii_ts, struct dp83640_private, mii_ts);
+
+	cfg->rx_filter = dp83640->hwts_rx_en;
+	cfg->tx_type = dp83640->hwts_tx_en;
+
+	return 0;
+}
+
+static int dp83640_hwtstamp_set(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg,
+				struct netlink_ext_ack *extack)
 {
 	struct dp83640_private *dp83640 =
 		container_of(mii_ts, struct dp83640_private, mii_ts);
@@ -1198,7 +1210,7 @@ static int dp83640_hwtstamp(struct mii_timestamper *mii_ts,
 	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
-		dp83640->hwts_rx_en = 1;
+		dp83640->hwts_rx_en = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
 		dp83640->layer = PTP_CLASS_L4;
 		dp83640->version = PTP_CLASS_V1;
 		cfg->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
@@ -1206,7 +1218,7 @@ static int dp83640_hwtstamp(struct mii_timestamper *mii_ts,
 	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
-		dp83640->hwts_rx_en = 1;
+		dp83640->hwts_rx_en = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
 		dp83640->layer = PTP_CLASS_L4;
 		dp83640->version = PTP_CLASS_V2;
 		cfg->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
@@ -1214,7 +1226,7 @@ static int dp83640_hwtstamp(struct mii_timestamper *mii_ts,
 	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
-		dp83640->hwts_rx_en = 1;
+		dp83640->hwts_rx_en = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
 		dp83640->layer = PTP_CLASS_L2;
 		dp83640->version = PTP_CLASS_V2;
 		cfg->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
@@ -1222,7 +1234,7 @@ static int dp83640_hwtstamp(struct mii_timestamper *mii_ts,
 	case HWTSTAMP_FILTER_PTP_V2_EVENT:
 	case HWTSTAMP_FILTER_PTP_V2_SYNC:
 	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
-		dp83640->hwts_rx_en = 1;
+		dp83640->hwts_rx_en = HWTSTAMP_FILTER_PTP_V2_EVENT;
 		dp83640->layer = PTP_CLASS_L4 | PTP_CLASS_L2;
 		dp83640->version = PTP_CLASS_V2;
 		cfg->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
@@ -1407,7 +1419,8 @@ static int dp83640_probe(struct phy_device *phydev)
 	dp83640->phydev = phydev;
 	dp83640->mii_ts.rxtstamp = dp83640_rxtstamp;
 	dp83640->mii_ts.txtstamp = dp83640_txtstamp;
-	dp83640->mii_ts.hwtstamp = dp83640_hwtstamp;
+	dp83640->mii_ts.hwtstamp_set = dp83640_hwtstamp_set;
+	dp83640->mii_ts.hwtstamp_get = dp83640_hwtstamp_get;
 	dp83640->mii_ts.ts_info  = dp83640_ts_info;
 
 	INIT_DELAYED_WORK(&dp83640->ts_work, rx_timestamp_work);
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 5d90ccc20df7..05de68b9f719 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -3147,9 +3147,9 @@ static void lan8814_flush_fifo(struct phy_device *phydev, bool egress)
 	lanphy_read_page_reg(phydev, LAN8814_PAGE_PORT_REGS, PTP_TSU_INT_STS);
 }
 
-static int lan8814_hwtstamp(struct mii_timestamper *mii_ts,
-			    struct kernel_hwtstamp_config *config,
-			    struct netlink_ext_ack *extack)
+static int lan8814_hwtstamp_set(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *config,
+				struct netlink_ext_ack *extack)
 {
 	struct kszphy_ptp_priv *ptp_priv =
 			  container_of(mii_ts, struct kszphy_ptp_priv, mii_ts);
@@ -4389,7 +4389,7 @@ static void lan8814_ptp_init(struct phy_device *phydev)
 
 	ptp_priv->mii_ts.rxtstamp = lan8814_rxtstamp;
 	ptp_priv->mii_ts.txtstamp = lan8814_txtstamp;
-	ptp_priv->mii_ts.hwtstamp = lan8814_hwtstamp;
+	ptp_priv->mii_ts.hwtstamp_set = lan8814_hwtstamp_set;
 	ptp_priv->mii_ts.ts_info  = lan8814_ts_info;
 
 	phydev->mii_ts = &ptp_priv->mii_ts;
@@ -5042,9 +5042,9 @@ static void lan8841_ptp_enable_processing(struct kszphy_ptp_priv *ptp_priv,
 #define LAN8841_PTP_TX_TIMESTAMP_EN		443
 #define LAN8841_PTP_TX_MOD			445
 
-static int lan8841_hwtstamp(struct mii_timestamper *mii_ts,
-			    struct kernel_hwtstamp_config *config,
-			    struct netlink_ext_ack *extack)
+static int lan8841_hwtstamp_set(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *config,
+				struct netlink_ext_ack *extack)
 {
 	struct kszphy_ptp_priv *ptp_priv = container_of(mii_ts, struct kszphy_ptp_priv, mii_ts);
 	struct phy_device *phydev = ptp_priv->phydev;
@@ -5924,7 +5924,7 @@ static int lan8841_probe(struct phy_device *phydev)
 
 	ptp_priv->mii_ts.rxtstamp = lan8841_rxtstamp;
 	ptp_priv->mii_ts.txtstamp = lan8814_txtstamp;
-	ptp_priv->mii_ts.hwtstamp = lan8841_hwtstamp;
+	ptp_priv->mii_ts.hwtstamp_set = lan8841_hwtstamp_set;
 	ptp_priv->mii_ts.ts_info = lan8841_ts_info;
 
 	phydev->mii_ts = &ptp_priv->mii_ts;
diff --git a/drivers/net/phy/microchip_rds_ptp.c b/drivers/net/phy/microchip_rds_ptp.c
index e6514ce04c29..4c6326b0ceaf 100644
--- a/drivers/net/phy/microchip_rds_ptp.c
+++ b/drivers/net/phy/microchip_rds_ptp.c
@@ -476,9 +476,9 @@ static bool mchp_rds_ptp_rxtstamp(struct mii_timestamper *mii_ts,
 	return true;
 }
 
-static int mchp_rds_ptp_hwtstamp(struct mii_timestamper *mii_ts,
-				 struct kernel_hwtstamp_config *config,
-				 struct netlink_ext_ack *extack)
+static int mchp_rds_ptp_hwtstamp_set(struct mii_timestamper *mii_ts,
+				     struct kernel_hwtstamp_config *config,
+				     struct netlink_ext_ack *extack)
 {
 	struct mchp_rds_ptp_clock *clock =
 				container_of(mii_ts, struct mchp_rds_ptp_clock,
@@ -1281,7 +1281,7 @@ struct mchp_rds_ptp_clock *mchp_rds_ptp_probe(struct phy_device *phydev, u8 mmd,
 
 	clock->mii_ts.rxtstamp = mchp_rds_ptp_rxtstamp;
 	clock->mii_ts.txtstamp = mchp_rds_ptp_txtstamp;
-	clock->mii_ts.hwtstamp = mchp_rds_ptp_hwtstamp;
+	clock->mii_ts.hwtstamp_set = mchp_rds_ptp_hwtstamp_set;
 	clock->mii_ts.ts_info = mchp_rds_ptp_ts_info;
 
 	phydev->mii_ts = &clock->mii_ts;
diff --git a/drivers/net/phy/mscc/mscc_ptp.c b/drivers/net/phy/mscc/mscc_ptp.c
index d692df7d975c..4865eac74b0e 100644
--- a/drivers/net/phy/mscc/mscc_ptp.c
+++ b/drivers/net/phy/mscc/mscc_ptp.c
@@ -1051,9 +1051,21 @@ static void vsc85xx_ts_reset_fifo(struct phy_device *phydev)
 			     val);
 }
 
-static int vsc85xx_hwtstamp(struct mii_timestamper *mii_ts,
-			    struct kernel_hwtstamp_config *cfg,
-			    struct netlink_ext_ack *extack)
+static int vsc85xx_hwtstamp_get(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg)
+{
+	struct vsc8531_private *vsc8531 =
+		container_of(mii_ts, struct vsc8531_private, mii_ts);
+
+	cfg->tx_type = vsc8531->ptp->tx_type;
+	cfg->rx_filter = vsc8531->ptp->rx_filter;
+
+	return 0;
+}
+
+static int vsc85xx_hwtstamp_set(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg,
+				struct netlink_ext_ack *extack)
 {
 	struct vsc8531_private *vsc8531 =
 		container_of(mii_ts, struct vsc8531_private, mii_ts);
@@ -1611,7 +1623,8 @@ int vsc8584_ptp_probe(struct phy_device *phydev)
 
 	vsc8531->mii_ts.rxtstamp = vsc85xx_rxtstamp;
 	vsc8531->mii_ts.txtstamp = vsc85xx_txtstamp;
-	vsc8531->mii_ts.hwtstamp = vsc85xx_hwtstamp;
+	vsc8531->mii_ts.hwtstamp_set = vsc85xx_hwtstamp_set;
+	vsc8531->mii_ts.hwtstamp_get = vsc85xx_hwtstamp_get;
 	vsc8531->mii_ts.ts_info  = vsc85xx_ts_info;
 	phydev->mii_ts = &vsc8531->mii_ts;
 
diff --git a/drivers/net/phy/nxp-c45-tja11xx.c b/drivers/net/phy/nxp-c45-tja11xx.c
index 87adb6508017..f526528d2e32 100644
--- a/drivers/net/phy/nxp-c45-tja11xx.c
+++ b/drivers/net/phy/nxp-c45-tja11xx.c
@@ -1012,9 +1012,22 @@ static bool nxp_c45_rxtstamp(struct mii_timestamper *mii_ts,
 	return true;
 }
 
-static int nxp_c45_hwtstamp(struct mii_timestamper *mii_ts,
-			    struct kernel_hwtstamp_config *cfg,
-			    struct netlink_ext_ack *extack)
+static int nxp_c45_hwtstamp_get(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg)
+{
+	struct nxp_c45_phy *priv = container_of(mii_ts, struct nxp_c45_phy,
+						mii_ts);
+
+	cfg->tx_type = priv->hwts_tx;
+	cfg->rx_filter = priv->hwts_rx ? HWTSTAMP_FILTER_PTP_V2_L2_EVENT
+				       : HWTSTAMP_FILTER_NONE;
+
+	return 0;
+}
+
+static int nxp_c45_hwtstamp_set(struct mii_timestamper *mii_ts,
+				struct kernel_hwtstamp_config *cfg,
+				struct netlink_ext_ack *extack)
 {
 	struct nxp_c45_phy *priv = container_of(mii_ts, struct nxp_c45_phy,
 						mii_ts);
@@ -1749,7 +1762,8 @@ static int nxp_c45_probe(struct phy_device *phydev)
 	    IS_ENABLED(CONFIG_NETWORK_PHY_TIMESTAMPING)) {
 		priv->mii_ts.rxtstamp = nxp_c45_rxtstamp;
 		priv->mii_ts.txtstamp = nxp_c45_txtstamp;
-		priv->mii_ts.hwtstamp = nxp_c45_hwtstamp;
+		priv->mii_ts.hwtstamp_set = nxp_c45_hwtstamp_set;
+		priv->mii_ts.hwtstamp_get = nxp_c45_hwtstamp_get;
 		priv->mii_ts.ts_info = nxp_c45_ts_info;
 		phydev->mii_ts = &priv->mii_ts;
 		ret = nxp_c45_init_ptp_clock(priv);
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 02da4a203ddd..13dd1691886d 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -405,12 +405,14 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 		return 0;
 
 	case SIOCSHWTSTAMP:
-		if (phydev->mii_ts && phydev->mii_ts->hwtstamp) {
+		if (phydev->mii_ts && phydev->mii_ts->hwtstamp_set) {
 			if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
 				return -EFAULT;
 
 			hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
-			ret = phydev->mii_ts->hwtstamp(phydev->mii_ts, &kernel_cfg, &extack);
+			ret = phydev->mii_ts->hwtstamp_set(phydev->mii_ts,
+							   &kernel_cfg,
+							   &extack);
 			if (ret)
 				return ret;
 
@@ -476,6 +478,9 @@ int __phy_hwtstamp_get(struct phy_device *phydev,
 	if (!phydev)
 		return -ENODEV;
 
+	if (phydev->mii_ts && phydev->mii_ts->hwtstamp_get)
+		return phydev->mii_ts->hwtstamp_get(phydev->mii_ts, config);
+
 	return -EOPNOTSUPP;
 }
 
@@ -493,8 +498,9 @@ int __phy_hwtstamp_set(struct phy_device *phydev,
 	if (!phydev)
 		return -ENODEV;
 
-	if (phydev->mii_ts && phydev->mii_ts->hwtstamp)
-		return phydev->mii_ts->hwtstamp(phydev->mii_ts, config, extack);
+	if (phydev->mii_ts && phydev->mii_ts->hwtstamp_set)
+		return phydev->mii_ts->hwtstamp_set(phydev->mii_ts, config,
+						    extack);
 
 	return -EOPNOTSUPP;
 }
diff --git a/drivers/ptp/ptp_ines.c b/drivers/ptp/ptp_ines.c
index 68f1f7fdaa9d..790eb42b78db 100644
--- a/drivers/ptp/ptp_ines.c
+++ b/drivers/ptp/ptp_ines.c
@@ -328,9 +328,31 @@ static u64 ines_find_txts(struct ines_port *port, struct sk_buff *skb)
 	return ns;
 }
 
-static int ines_hwtstamp(struct mii_timestamper *mii_ts,
-			 struct kernel_hwtstamp_config *cfg,
-			 struct netlink_ext_ack *extack)
+static int ines_hwtstamp_get(struct mii_timestamper *mii_ts,
+			     struct kernel_hwtstamp_config *cfg)
+{
+	struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
+	unsigned long flags;
+	u32 port_conf;
+
+	cfg->rx_filter = port->rxts_enabled ? HWTSTAMP_FILTER_PTP_V2_EVENT
+					    : HWTSTAMP_FILTER_NONE;
+	if (port->txts_enabled) {
+		spin_lock_irqsave(&port->lock, flags);
+		port_conf = ines_read32(port, port_conf);
+		spin_unlock_irqrestore(&port->lock, flags);
+		cfg->tx_type = (port_conf & CM_ONE_STEP) ? HWTSTAMP_TX_ONESTEP_P2P
+							 : HWTSTAMP_TX_OFF;
+	} else {
+		cfg->tx_type = HWTSTAMP_TX_OFF;
+	}
+
+	return 0;
+}
+
+static int ines_hwtstamp_set(struct mii_timestamper *mii_ts,
+			     struct kernel_hwtstamp_config *cfg,
+			     struct netlink_ext_ack *extack)
 {
 	struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
 	u32 cm_one_step = 0, port_conf, ts_stat_rx, ts_stat_tx;
@@ -709,7 +731,8 @@ static struct mii_timestamper *ines_ptp_probe_channel(struct device *device,
 	}
 	port->mii_ts.rxtstamp = ines_rxtstamp;
 	port->mii_ts.txtstamp = ines_txtstamp;
-	port->mii_ts.hwtstamp = ines_hwtstamp;
+	port->mii_ts.hwtstamp_set = ines_hwtstamp_set;
+	port->mii_ts.hwtstamp_get = ines_hwtstamp_get;
 	port->mii_ts.link_state = ines_link_state;
 	port->mii_ts.ts_info = ines_ts_info;
 
diff --git a/include/linux/mii_timestamper.h b/include/linux/mii_timestamper.h
index 995db62570f9..3102c425c8e0 100644
--- a/include/linux/mii_timestamper.h
+++ b/include/linux/mii_timestamper.h
@@ -27,7 +27,9 @@ struct phy_device;
  *		as soon as a timestamp becomes available. One of the PTP_CLASS_
  *		values is passed in 'type'.
  *
- * @hwtstamp:	Handles SIOCSHWTSTAMP ioctl for hardware time stamping.
+ * @hwtstamp_set: Handles SIOCSHWTSTAMP ioctl for hardware time stamping.
+ *
+ * @hwtstamp_get: Handles SIOCGHWTSTAMP ioctl for hardware time stamping.
  *
  * @link_state: Allows the device to respond to changes in the link
  *		state.  The caller invokes this function while holding
@@ -51,9 +53,12 @@ struct mii_timestamper {
 	void (*txtstamp)(struct mii_timestamper *mii_ts,
 			 struct sk_buff *skb, int type);
 
-	int  (*hwtstamp)(struct mii_timestamper *mii_ts,
-			 struct kernel_hwtstamp_config *kernel_config,
-			 struct netlink_ext_ack *extack);
+	int  (*hwtstamp_set)(struct mii_timestamper *mii_ts,
+			     struct kernel_hwtstamp_config *kernel_config,
+			     struct netlink_ext_ack *extack);
+
+	int  (*hwtstamp_get)(struct mii_timestamper *mii_ts,
+			     struct kernel_hwtstamp_config *kernel_config);
 
 	void (*link_state)(struct mii_timestamper *mii_ts,
 			   struct phy_device *phydev);
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 65b0c3ca6a2b..059a104223c4 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1915,7 +1915,7 @@ static inline bool phy_polling_mode(struct phy_device *phydev)
  */
 static inline bool phy_has_hwtstamp(struct phy_device *phydev)
 {
-	return phydev && phydev->mii_ts && phydev->mii_ts->hwtstamp;
+	return phydev && phydev->mii_ts && phydev->mii_ts->hwtstamp_set;
 }
 
 /**
@@ -1950,7 +1950,7 @@ static inline int phy_hwtstamp(struct phy_device *phydev,
 			       struct kernel_hwtstamp_config *cfg,
 			       struct netlink_ext_ack *extack)
 {
-	return phydev->mii_ts->hwtstamp(phydev->mii_ts, cfg, extack);
+	return phydev->mii_ts->hwtstamp_set(phydev->mii_ts, cfg, extack);
 }
 
 static inline bool phy_rxtstamp(struct phy_device *phydev, struct sk_buff *skb,
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 0720ccc14df9..53a53357cfef 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -249,10 +249,11 @@ int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
  *
  * Helper for calling the default hardware provider timestamping.
  *
- * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and
- * there only exists a phydev->mii_ts->hwtstamp() method. So this will return
- * -EOPNOTSUPP for phylib for now, which is still more accurate than letting
- * the netdev handle the GET request.
+ * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), but
+ * phydev->mii_ts has both hwtstamp_get() and hwtstamp_set() methods. So this
+ * will return -EOPNOTSUPP for phylib only if hwtstamp_get() is not
+ * implemented for now, which is still more accurate than letting the netdev
+ * handle the GET request.
  */
 int dev_get_hwtstamp_phylib(struct net_device *dev,
 			    struct kernel_hwtstamp_config *cfg)