ptp: ocp: Add serial port information to the debug summary

On the debug summary page, show the /dev/ttyS<port> mapping.
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/r/20220304054615.1737-1-jonathan.lemon@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/ptp/ptp_ocp.c

@@ -2109,6 +2109,14 @@ ptp_ocp_summary_show(struct seq_file *s, void *data)
 	sma_out = ioread32(&bp->sma->gpio2);
 
 	seq_printf(s, "%7s: /dev/ptp%d\n", "PTP", ptp_clock_index(bp->ptp));
+	if (bp->gnss_port != -1)
+		seq_printf(s, "%7s: /dev/ttyS%d\n", "GNSS1", bp->gnss_port);
+	if (bp->gnss2_port != -1)
+		seq_printf(s, "%7s: /dev/ttyS%d\n", "GNSS2", bp->gnss2_port);
+	if (bp->mac_port != -1)
+		seq_printf(s, "%7s: /dev/ttyS%d\n", "MAC", bp->mac_port);
+	if (bp->nmea_port != -1)
+		seq_printf(s, "%7s: /dev/ttyS%d\n", "NMEA", bp->nmea_port);
 
 	sma1_show(dev, NULL, buf);
 	seq_printf(s, "   sma1: %s", buf);