linux-kernel - [PATCH net-next 15/15] net: dsa: sja1105: permit finding the XPCS via pcs-handle

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Message-Id: <20251118190530.580267-16-vladimir.oltean@nxp.com>
Date: Tue, 18 Nov 2025 21:05:30 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org
Subject: [PATCH net-next 15/15] net: dsa: sja1105: permit finding the XPCS via pcs-handle

This completes support for describing the XPCS in the device tree,
rather than just the case where sja1105_fill_device_tree() populates it.
Having it in the device tree is necessary when configuring lane polarity.

Cc: Rob Herring <robh@...nel.org>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: Conor Dooley <conor+dt@...nel.org>
Cc: devicetree@...r.kernel.org
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 70aecdf9fd0e..e62b2facc1be 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -3035,14 +3035,26 @@ static int sja1105_port_bridge_flags(struct dsa_switch *ds, int port,
 
 static int sja1105_create_pcs(struct dsa_switch *ds, int port)
 {
+	struct dsa_port *dp = dsa_to_port(ds, port);
 	struct sja1105_private *priv = ds->priv;
+	struct fwnode_handle *pcs_fwnode;
 	struct phylink_pcs *pcs;
 
 	if (priv->phy_mode[port] != PHY_INTERFACE_MODE_SGMII &&
 	    priv->phy_mode[port] != PHY_INTERFACE_MODE_2500BASEX)
 		return 0;
 
-	pcs = xpcs_create_pcs_fwnode(priv->pcs_fwnode[port]);
+	pcs_fwnode = fwnode_handle_get(priv->pcs_fwnode[port]);
+	/* priv->pcs_fwnode[port] is only set if the PCS is absent
+	 * from the device tree source. If present, there needs to
+	 * be a pcs-handle to it.
+	 */
+	if (!pcs_fwnode)
+		pcs_fwnode = fwnode_find_reference(of_fwnode_handle(dp->dn),
+						   "pcs-handle", 0);
+
+	pcs = xpcs_create_pcs_fwnode(pcs_fwnode);
+	fwnode_handle_put(pcs_fwnode);
 	if (IS_ERR(pcs))
 		return PTR_ERR(pcs);
 
-- 
2.34.1