linux-kernel - [PATCH net-next 9/9] net: dsa: microchip: Wrap timestamp reading in a function

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Message-Id: <20260105-ksz-rework-v1-9-a68df7f57375@bootlin.com>
Date: Mon, 05 Jan 2026 14:08:08 +0100
From: "Bastien Curutchet (Schneider Electric)" <bastien.curutchet@...tlin.com>
To: Woojung Huh <woojung.huh@...rochip.com>, UNGLinuxDriver@...rochip.com, 
 Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Richard Cochran <richardcochran@...il.com>
Cc: Pascal Eberhard <pascal.eberhard@...com>, 
 Miquèl Raynal <miquel.raynal@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 "Bastien Curutchet (Schneider Electric)" <bastien.curutchet@...tlin.com>
Subject: [PATCH net-next 9/9] net: dsa: microchip: Wrap timestamp reading
 in a function

Timestamps are directly accessed through a register read in the
interrupt handler. KSZ8463's logic to access it will be a bit more
complex because the same interrupt can be triggered by two different
timestamps being ready.

Wrap the timestamp's reading in a dedicated function to ease the
KSZ8463's integration in upcoming patches.

Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@...tlin.com>
---
 drivers/net/dsa/microchip/ksz_ptp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c
index b3fff0643ea7a63aec924ec1cd9b451ecfeeab3d..4a2cc57a628f97bd51fcb11057bc4effda9205dd 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.c
+++ b/drivers/net/dsa/microchip/ksz_ptp.c
@@ -967,6 +967,11 @@ void ksz_ptp_clock_unregister(struct dsa_switch *ds)
 		ptp_clock_unregister(ptp_data->clock);
 }

+static int ksz_read_ts(struct ksz_port *port, u16 reg, u32 *ts)
+{
+	return ksz_read32(port->ksz_dev, reg, ts);
+}
+
 static irqreturn_t ksz_ptp_msg_thread_fn(int irq, void *dev_id)
 {
 	struct ksz_ptp_irq *ptpmsg_irq = dev_id;
@@ -980,7 +985,7 @@ static irqreturn_t ksz_ptp_msg_thread_fn(int irq, void *dev_id)
 	dev = port->ksz_dev;

 	if (ptpmsg_irq->ts_en) {
-		ret = ksz_read32(dev, ptpmsg_irq->ts_reg, &tstamp_raw);
+		ret = ksz_read_ts(port, ptpmsg_irq->ts_reg, &tstamp_raw);
 		if (ret)
 			return IRQ_NONE;

-- 
2.52.0