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 <[e-mail]>
Signed-off-by: Vadim Fedorenko <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

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

···
 	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_set(struct mii_timestamper *mii_ts,
 				struct kernel_hwtstamp_config *cfg,
 				struct netlink_ext_ack *extack)
···
 	priv->mii_ts.rxtstamp = bcm_ptp_rxtstamp;
 	priv->mii_ts.txtstamp = bcm_ptp_txtstamp;
 	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;