netdev - [PATCH net-next v2 08/10] ptp: ocp: fix PPS source selector reporting

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Message-Id: <20220506221531.1308-9-jonathan.lemon@gmail.com>
Date:   Fri,  6 May 2022 15:15:29 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     netdev@...r.kernel.org
Cc:     richardcochran@...il.com, kernel-team@...com, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com
Subject: [PATCH net-next v2 08/10] ptp: ocp: fix PPS source selector reporting

The NTL timecard design has a PPS1 selector which selects the
the PPS source automatically, according to Section 1.9 of the
documentation.

  If there is a SMA PPS input detected:
     - send signal to MAC and PPS slave selector.

  If there is a MAC PPS input detected:
     - send GNSS1 to the MAC
     - send MAC to the PPS slave

  If there is a GNSS1 input detected:
     - send GNSS1 to the MAC
     - send GNSS1 to the PPS slave.MAC

Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
 drivers/ptp/ptp_ocp.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index ec3c21655382..787561be37da 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -3071,10 +3071,10 @@ ptp_ocp_summary_show(struct seq_file *s, void *data)
 	struct device *dev = s->private;
 	struct ptp_system_timestamp sts;
 	struct ts_reg __iomem *ts_reg;
+	char *buf, *src, *mac_src;
 	struct timespec64 ts;
 	struct ptp_ocp *bp;
 	u16 sma_val[4][2];
-	char *src, *buf;
 	u32 ctrl, val;
 	bool on, map;
 	int i;
@@ -3237,17 +3237,26 @@ ptp_ocp_summary_show(struct seq_file *s, void *data)
 	if (bp->pps_select) {
 		val = ioread32(&bp->pps_select->gpio1);
 		src = &buf[80];
-		if (val & 0x01)
+		mac_src = "GNSS1";
+		if (val & 0x01) {
 			gpio_input_map(src, bp, sma_val, 0, NULL);
-		else if (val & 0x02)
+			mac_src = src;
+		} else if (val & 0x02)
 			src = "MAC";
 		else if (val & 0x04)
 			src = "GNSS1";
-		else
+		else {
 			src = "----";
+			mac_src = src;
+		}
 	} else {
 		src = "?";
+		mac_src = src;
 	}
+	seq_printf(s, "MAC PPS1 src: %s\n", mac_src);
+
+	gpio_input_map(buf, bp, sma_val, 1, "GNSS2");
+	seq_printf(s, "MAC PPS2 src: %s\n", buf);
 
 	/* assumes automatic switchover/selection */
 	val = ioread32(&bp->reg->select);
@@ -3272,12 +3281,6 @@ ptp_ocp_summary_show(struct seq_file *s, void *data)
 	seq_printf(s, "%7s: %s, state: %s\n", "PHC src", buf,
 		   val & OCP_STATUS_IN_SYNC ? "sync" : "unsynced");
 
-	/* reuses PPS1 src from earlier */
-	seq_printf(s, "MAC PPS1 src: %s\n", src);
-
-	gpio_input_map(buf, bp, sma_val, 1, "GNSS2");
-	seq_printf(s, "MAC PPS2 src: %s\n", buf);
-
 	if (!ptp_ocp_gettimex(&bp->ptp_info, &ts, &sts)) {
 		struct timespec64 sys_ts;
 		s64 pre_ns, post_ns, ns;
-- 
2.31.1