net: phy: dp83640: add HW timestamp configuration reporting

The driver stores configuration of TX timestamping and can technically
report it. Patch RX timestamp configuration storage to be more precise
on reporting and add callback to actually report it.

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

drivers/net/phy/dp83640.c

···
 	return IRQ_HANDLED;
 }
 
+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)
···
 	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;
···
 	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;
···
 	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;
···
 	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;
···
 	dp83640->mii_ts.rxtstamp = dp83640_rxtstamp;
 	dp83640->mii_ts.txtstamp = dp83640_txtstamp;
 	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);