ptp: ptp_ines: add HW timestamp configuration reporting

The driver partially stores HW timestamping configuration, but missing
pieces can be read from HW. Add callback to report configuration.

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/ptp/ptp_ines.c

···
 	return ns;
 }
 
+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)
···
 	port->mii_ts.rxtstamp = ines_rxtstamp;
 	port->mii_ts.txtstamp = ines_txtstamp;
 	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;