net: phy: broadcom: add HW timestamp configuration reporting

The driver stores configuration information and can technically report
it. Implement hwtstamp_get callback to report the configuration.

Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20251124181151.277256-4-vadim.fedorenko@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 1cff839)

Author: Vadim Fedorenko

drivers/net/phy/bcm-phy-ptp.c

@@ -780,6 +780,18 @@ static void bcm_ptp_txtstamp(struct mii_timestamper *mii_ts,
 	kfree_skb(skb);
 }
 
+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(struct mii_timestamper *mii_ts,
 			    struct kernel_hwtstamp_config *cfg,
 			    struct netlink_ext_ack *extack)
@@ -899,6 +911,7 @@ 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_get = bcm_ptp_hwtstamp_get;
 	priv->mii_ts.ts_info = bcm_ptp_ts_info;
 
 	priv->phydev->mii_ts = &priv->mii_ts;