netdev - [PATCH net-next 2/3] net: dsa: mxl-gsw1xx: configure PCS polarities

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Message-ID: <db296e8f477f34498979cd580898170f8ae537e5.1769519758.git.daniel@makrotopia.org>
Date: Tue, 27 Jan 2026 13:18:45 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: Hauke Mehrtens <hauke@...ke-m.de>, 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>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/3] net: dsa: mxl-gsw1xx: configure PCS polarities

Configure SerDes PCS RX and TX polarities using the newly
introduced generic properties.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/dsa/lantiq/Kconfig      |  1 +
 drivers/net/dsa/lantiq/mxl-gsw1xx.c | 38 +++++++++++++++++++++--------
 2 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/net/dsa/lantiq/Kconfig b/drivers/net/dsa/lantiq/Kconfig
index bad13817af25..98efeef2661b 100644
--- a/drivers/net/dsa/lantiq/Kconfig
+++ b/drivers/net/dsa/lantiq/Kconfig
@@ -15,6 +15,7 @@ config NET_DSA_MXL_GSW1XX
 	tristate "MaxLinear GSW1xx Ethernet switch support"
 	select NET_DSA_TAG_MXL_GSW1XX
 	select NET_DSA_LANTIQ_COMMON
+	select PHY_COMMON_PROPS
 	help
 	  This enables support for the Intel/MaxLinear GSW1xx family of 1GE
 	  switches.
diff --git a/drivers/net/dsa/lantiq/mxl-gsw1xx.c b/drivers/net/dsa/lantiq/mxl-gsw1xx.c
index 79cf72cc77be..6284b9afdbbb 100644
--- a/drivers/net/dsa/lantiq/mxl-gsw1xx.c
+++ b/drivers/net/dsa/lantiq/mxl-gsw1xx.c
@@ -15,6 +15,8 @@
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of_mdio.h>
+#include <linux/phy/phy-common-props.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/workqueue.h>
 #include <net/dsa.h>
@@ -229,11 +231,17 @@ static int gsw1xx_pcs_phy_xaui_write(struct gsw1xx_priv *priv, u16 addr,
 					1000, 100000);
 }
 
-static int gsw1xx_pcs_reset(struct gsw1xx_priv *priv)
+static int gsw1xx_pcs_reset(struct gsw1xx_priv *priv, phy_interface_t interface)
 {
+	struct dsa_port *pcs_port;
+	unsigned int pol;
 	int ret;
 	u16 val;
 
+	pcs_port = dsa_to_port(priv->gswip.ds, GSW1XX_SGMII_PORT);
+	if (!pcs_port)
+		return -EINVAL;
+
 	/* Assert and deassert SGMII shell reset */
 	ret = regmap_set_bits(priv->shell, GSW1XX_SHELL_RST_REQ,
 			      GSW1XX_RST_REQ_SGMII_SHELL);
@@ -260,15 +268,19 @@ static int gsw1xx_pcs_reset(struct gsw1xx_priv *priv)
 	      FIELD_PREP(GSW1XX_SGMII_PHY_RX0_CFG2_FILT_CNT,
 			 GSW1XX_SGMII_PHY_RX0_CFG2_FILT_CNT_DEF);
 
+	ret = phy_get_rx_polarity(of_fwnode_handle(pcs_port->dn),
+				  phy_modes(interface),
+				  BIT(PHY_POL_NORMAL) | BIT(PHY_POL_INVERT),
+				  PHY_POL_NORMAL, &pol);
+	if (ret)
+		return ret;
+
 	/* RX lane seems to be inverted internally, so bit
 	 * GSW1XX_SGMII_PHY_RX0_CFG2_INVERT needs to be set for normal
 	 * (ie. non-inverted) operation.
-	 *
-	 * TODO: Take care of inverted RX pair once generic property is
-	 *       available
 	 */
-
-	val |= GSW1XX_SGMII_PHY_RX0_CFG2_INVERT;
+	if (pol == PHY_POL_NORMAL)
+		val |= GSW1XX_SGMII_PHY_RX0_CFG2_INVERT;
 
 	ret = regmap_write(priv->sgmii, GSW1XX_SGMII_PHY_RX0_CFG2, val);
 	if (ret < 0)
@@ -277,9 +289,15 @@ static int gsw1xx_pcs_reset(struct gsw1xx_priv *priv)
 	val = FIELD_PREP(GSW1XX_SGMII_PHY_TX0_CFG3_VBOOST_LEVEL,
 			 GSW1XX_SGMII_PHY_TX0_CFG3_VBOOST_LEVEL_DEF);
 
-	/* TODO: Take care of inverted TX pair once generic property is
-	 *       available
-	 */
+	ret = phy_get_tx_polarity(of_fwnode_handle(pcs_port->dn),
+				  phy_modes(interface),
+				  BIT(PHY_POL_NORMAL) | BIT(PHY_POL_INVERT),
+				  PHY_POL_NORMAL, &pol);
+	if (ret)
+		return ret;
+
+	if (pol == PHY_POL_INVERT)
+		val |= GSW1XX_SGMII_PHY_TX0_CFG3_INVERT;
 
 	ret = regmap_write(priv->sgmii, GSW1XX_SGMII_PHY_TX0_CFG3, val);
 	if (ret < 0)
@@ -336,7 +354,7 @@ static int gsw1xx_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
 	priv->tbi_interface = PHY_INTERFACE_MODE_NA;
 
 	if (!reconf)
-		ret = gsw1xx_pcs_reset(priv);
+		ret = gsw1xx_pcs_reset(priv, interface);
 
 	if (ret)
 		return ret;
-- 
2.52.0