diff --git a/MAINTAINERS b/MAINTAINERS
index 004c0d1e723d..c0ba005349fd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13209,6 +13209,7 @@ M:	Vladimir Oltean <olteanv@gmail.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 F:	drivers/net/dsa/sja1105
+F:	drivers/net/pcs/pcs-xpcs-nxp.c
 
 NXP TDA998X DRM DRIVER
 M:	Russell King <linux@armlinux.org.uk>
diff --git a/drivers/net/pcs/Makefile b/drivers/net/pcs/Makefile
index c23146755972..d12b00e48358 100644
--- a/drivers/net/pcs/Makefile
+++ b/drivers/net/pcs/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for Linux PCS drivers
 
-obj-$(CONFIG_PCS_XPCS)		+= pcs-xpcs.o
+obj-$(CONFIG_PCS_XPCS)		+= pcs-xpcs.o pcs-xpcs-nxp.o
 obj-$(CONFIG_PCS_LYNX)		+= pcs-lynx.o
diff --git a/drivers/net/pcs/pcs-xpcs-nxp.c b/drivers/net/pcs/pcs-xpcs-nxp.c
new file mode 100644
index 000000000000..51b2fc7d36a9
--- /dev/null
+++ b/drivers/net/pcs/pcs-xpcs-nxp.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright 2021 NXP Semiconductors
+ */
+#include <linux/pcs/pcs-xpcs.h>
+#include "pcs-xpcs.h"
+
+/* In NXP SJA1105, the PCS is integrated with a PMA that has the TX lane
+ * polarity inverted by default (PLUS is MINUS, MINUS is PLUS). To obtain
+ * normal non-inverted behavior, the TX lane polarity must be inverted in the
+ * PCS, via the DIGITAL_CONTROL_2 register.
+ */
+int nxp_sja1105_sgmii_pma_config(struct dw_xpcs *xpcs)
+{
+	return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL2,
+			  DW_VR_MII_DIG_CTRL2_TX_POL_INV);
+}
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index ecf5011977d3..3b1baacfaf8f 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -117,6 +117,7 @@ struct xpcs_compat {
 	const phy_interface_t *interface;
 	int num_interfaces;
 	int an_mode;
+	int (*pma_config)(struct dw_xpcs *xpcs);
 };
 
 struct xpcs_id {
@@ -168,7 +169,7 @@ static bool __xpcs_linkmode_supported(const struct xpcs_compat *compat,
 #define xpcs_linkmode_supported(compat, mode) \
 	__xpcs_linkmode_supported(compat, ETHTOOL_LINK_MODE_ ## mode ## _BIT)
 
-static int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg)
+int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg)
 {
 	u32 reg_addr = mdiobus_c45_addr(dev, reg);
 	struct mii_bus *bus = xpcs->mdiodev->bus;
@@ -177,7 +178,7 @@ static int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg)
 	return mdiobus_read(bus, addr, reg_addr);
 }
 
-static int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val)
+int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val)
 {
 	u32 reg_addr = mdiobus_c45_addr(dev, reg);
 	struct mii_bus *bus = xpcs->mdiodev->bus;
@@ -788,6 +789,12 @@ static int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		return -1;
 	}
 
+	if (compat->pma_config) {
+		ret = compat->pma_config(xpcs);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 
@@ -1022,11 +1029,25 @@ static const struct xpcs_compat synopsys_xpcs_compat[DW_XPCS_INTERFACE_MAX] = {
 	},
 };
 
+static const struct xpcs_compat nxp_sja1105_xpcs_compat[DW_XPCS_INTERFACE_MAX] = {
+	[DW_XPCS_SGMII] = {
+		.supported = xpcs_sgmii_features,
+		.interface = xpcs_sgmii_interfaces,
+		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_interfaces),
+		.an_mode = DW_AN_C37_SGMII,
+		.pma_config = nxp_sja1105_sgmii_pma_config,
+	},
+};
+
 static const struct xpcs_id xpcs_id_list[] = {
 	{
 		.id = SYNOPSYS_XPCS_ID,
 		.mask = SYNOPSYS_XPCS_MASK,
 		.compat = synopsys_xpcs_compat,
+	}, {
+		.id = NXP_SJA1105_XPCS_ID,
+		.mask = SYNOPSYS_XPCS_MASK,
+		.compat = nxp_sja1105_xpcs_compat,
 	},
 };
 
diff --git a/drivers/net/pcs/pcs-xpcs.h b/drivers/net/pcs/pcs-xpcs.h
index 867537a68c63..3daf4276a158 100644
--- a/drivers/net/pcs/pcs-xpcs.h
+++ b/drivers/net/pcs/pcs-xpcs.h
@@ -60,10 +60,15 @@
 /* EEE Mode Control Register */
 #define DW_VR_MII_EEE_MCTRL0		0x8006
 #define DW_VR_MII_EEE_MCTRL1		0x800b
+#define DW_VR_MII_DIG_CTRL2		0x80e1
 
 /* VR_MII_DIG_CTRL1 */
 #define DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW		BIT(9)
 
+/* VR_MII_DIG_CTRL2 */
+#define DW_VR_MII_DIG_CTRL2_TX_POL_INV		BIT(4)
+#define DW_VR_MII_DIG_CTRL2_RX_POL_INV		BIT(0)
+
 /* VR_MII_AN_CTRL */
 #define DW_VR_MII_AN_CTRL_TX_CONFIG_SHIFT	3
 #define DW_VR_MII_TX_CONFIG_MASK		BIT(3)
@@ -101,3 +106,8 @@
 
 /* VR MII EEE Control 1 defines */
 #define DW_VR_MII_EEE_TRN_LPI		BIT(0)	/* Transparent Mode Enable */
+
+int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg);
+int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val);
+
+int nxp_sja1105_sgmii_pma_config(struct dw_xpcs *xpcs);
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index 4f1cdf6f3d4c..c594f7cdc304 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -10,6 +10,8 @@
 #include <linux/phy.h>
 #include <linux/phylink.h>
 
+#define NXP_SJA1105_XPCS_ID		0x00000010
+
 /* AN mode */
 #define DW_AN_C73			1
 #define DW_AN_C37_SGMII			2
