Merge branch 'net-mdio-continue-separating-c22-and-c45'

Michael Walle says:

====================
net: mdio: Continue separating C22 and C45

I've picked this older series from Andrew up and rebased it onto
the latest net-next.

This is the second patch set in the series which separates the C22
and C45 MDIO bus transactions at the API level to the MDIO bus drivers.
====================

Link: https://lore.kernel.org/r/20230112-net-next-c45-seperation-part-2-v1-0-5eeaae931526@walle.cc
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

16 files changed, 766 insertions, 432 deletions

diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 01ac70fd7ddf..cbcc457499f3 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -954,8 +954,10 @@ static int vsc9959_mdio_bus_alloc(struct ocelot *ocelot)
 		return -ENOMEM;
 
 	bus->name = "VSC9959 internal MDIO bus";
-	bus->read = enetc_mdio_read;
-	bus->write = enetc_mdio_write;
+	bus->read = enetc_mdio_read_c22;
+	bus->write = enetc_mdio_write_c22;
+	bus->read_c45 = enetc_mdio_read_c45;
+	bus->write_c45 = enetc_mdio_write_c45;
 	bus->parent = dev;
 	mdio_priv = bus->priv;
 	mdio_priv->hw = hw;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_mdio.c b/drivers/net/ethernet/freescale/enetc/enetc_mdio.c
index 1c8f5cc6dec4..998aaa394e9c 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_mdio.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_mdio.c
@@ -55,7 +55,8 @@ static int enetc_mdio_wait_complete(struct enetc_mdio_priv *mdio_priv)
 				  is_busy, !is_busy, 10, 10 * 1000);
 }
 
-int enetc_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 value)
+int enetc_mdio_write_c22(struct mii_bus *bus, int phy_id, int regnum,
+			 u16 value)
 {
 	struct enetc_mdio_priv *mdio_priv = bus->priv;
 	u32 mdio_ctl, mdio_cfg;
@@ -63,14 +64,39 @@ int enetc_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 value)
 	int ret;
 
 	mdio_cfg = ENETC_EMDIO_CFG;
-	if (regnum & MII_ADDR_C45) {
-		dev_addr = (regnum >> 16) & 0x1f;
-		mdio_cfg |= MDIO_CFG_ENC45;
-	} else {
-		/* clause 22 (ie 1G) */
-		dev_addr = regnum & 0x1f;
-		mdio_cfg &= ~MDIO_CFG_ENC45;
-	}
+	dev_addr = regnum & 0x1f;
+	mdio_cfg &= ~MDIO_CFG_ENC45;
+
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CFG, mdio_cfg);
+
+	ret = enetc_mdio_wait_complete(mdio_priv);
+	if (ret)
+		return ret;
+
+	/* set port and dev addr */
+	mdio_ctl = MDIO_CTL_PORT_ADDR(phy_id) | MDIO_CTL_DEV_ADDR(dev_addr);
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CTL, mdio_ctl);
+
+	/* write the value */
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_DATA, value);
+
+	ret = enetc_mdio_wait_complete(mdio_priv);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(enetc_mdio_write_c22);
+
+int enetc_mdio_write_c45(struct mii_bus *bus, int phy_id, int dev_addr,
+			 int regnum, u16 value)
+{
+	struct enetc_mdio_priv *mdio_priv = bus->priv;
+	u32 mdio_ctl, mdio_cfg;
+	int ret;
+
+	mdio_cfg = ENETC_EMDIO_CFG;
+	mdio_cfg |= MDIO_CFG_ENC45;
 
 	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CFG, mdio_cfg);
 
@@ -83,13 +109,11 @@ int enetc_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 value)
 	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CTL, mdio_ctl);
 
 	/* set the register address */
-	if (regnum & MII_ADDR_C45) {
-		enetc_mdio_wr(mdio_priv, ENETC_MDIO_ADDR, regnum & 0xffff);
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_ADDR, regnum & 0xffff);
 
-		ret = enetc_mdio_wait_complete(mdio_priv);
-		if (ret)
-			return ret;
-	}
+	ret = enetc_mdio_wait_complete(mdio_priv);
+	if (ret)
+		return ret;
 
 	/* write the value */
 	enetc_mdio_wr(mdio_priv, ENETC_MDIO_DATA, value);
@@ -100,9 +124,9 @@ int enetc_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 value)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(enetc_mdio_write);
+EXPORT_SYMBOL_GPL(enetc_mdio_write_c45);
 
-int enetc_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
+int enetc_mdio_read_c22(struct mii_bus *bus, int phy_id, int regnum)
 {
 	struct enetc_mdio_priv *mdio_priv = bus->priv;
 	u32 mdio_ctl, mdio_cfg;
@@ -110,14 +134,51 @@ int enetc_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 	int ret;
 
 	mdio_cfg = ENETC_EMDIO_CFG;
-	if (regnum & MII_ADDR_C45) {
-		dev_addr = (regnum >> 16) & 0x1f;
-		mdio_cfg |= MDIO_CFG_ENC45;
-	} else {
-		dev_addr = regnum & 0x1f;
-		mdio_cfg &= ~MDIO_CFG_ENC45;
+	dev_addr = regnum & 0x1f;
+	mdio_cfg &= ~MDIO_CFG_ENC45;
+
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CFG, mdio_cfg);
+
+	ret = enetc_mdio_wait_complete(mdio_priv);
+	if (ret)
+		return ret;
+
+	/* set port and device addr */
+	mdio_ctl = MDIO_CTL_PORT_ADDR(phy_id) | MDIO_CTL_DEV_ADDR(dev_addr);
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CTL, mdio_ctl);
+
+	/* initiate the read */
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CTL, mdio_ctl | MDIO_CTL_READ);
+
+	ret = enetc_mdio_wait_complete(mdio_priv);
+	if (ret)
+		return ret;
+
+	/* return all Fs if nothing was there */
+	if (enetc_mdio_rd(mdio_priv, ENETC_MDIO_CFG) & MDIO_CFG_RD_ER) {
+		dev_dbg(&bus->dev,
+			"Error while reading PHY%d reg at %d.%d\n",
+			phy_id, dev_addr, regnum);
+		return 0xffff;
 	}
 
+	value = enetc_mdio_rd(mdio_priv, ENETC_MDIO_DATA) & 0xffff;
+
+	return value;
+}
+EXPORT_SYMBOL_GPL(enetc_mdio_read_c22);
+
+int enetc_mdio_read_c45(struct mii_bus *bus, int phy_id, int dev_addr,
+			int regnum)
+{
+	struct enetc_mdio_priv *mdio_priv = bus->priv;
+	u32 mdio_ctl, mdio_cfg;
+	u16 value;
+	int ret;
+
+	mdio_cfg = ENETC_EMDIO_CFG;
+	mdio_cfg |= MDIO_CFG_ENC45;
+
 	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CFG, mdio_cfg);
 
 	ret = enetc_mdio_wait_complete(mdio_priv);
@@ -129,13 +190,11 @@ int enetc_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CTL, mdio_ctl);
 
 	/* set the register address */
-	if (regnum & MII_ADDR_C45) {
-		enetc_mdio_wr(mdio_priv, ENETC_MDIO_ADDR, regnum & 0xffff);
+	enetc_mdio_wr(mdio_priv, ENETC_MDIO_ADDR, regnum & 0xffff);
 
-		ret = enetc_mdio_wait_complete(mdio_priv);
-		if (ret)
-			return ret;
-	}
+	ret = enetc_mdio_wait_complete(mdio_priv);
+	if (ret)
+		return ret;
 
 	/* initiate the read */
 	enetc_mdio_wr(mdio_priv, ENETC_MDIO_CTL, mdio_ctl | MDIO_CTL_READ);
@@ -156,7 +215,7 @@ int enetc_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 
 	return value;
 }
-EXPORT_SYMBOL_GPL(enetc_mdio_read);
+EXPORT_SYMBOL_GPL(enetc_mdio_read_c45);
 
 struct enetc_hw *enetc_hw_alloc(struct device *dev, void __iomem *port_regs)
 {
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c b/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c
index dafb26f81f95..a1b595bd7993 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c
@@ -39,8 +39,10 @@ static int enetc_pci_mdio_probe(struct pci_dev *pdev,
 	}
 
 	bus->name = ENETC_MDIO_BUS_NAME;
-	bus->read = enetc_mdio_read;
-	bus->write = enetc_mdio_write;
+	bus->read = enetc_mdio_read_c22;
+	bus->write = enetc_mdio_write_c22;
+	bus->read_c45 = enetc_mdio_read_c45;
+	bus->write_c45 = enetc_mdio_write_c45;
 	bus->parent = dev;
 	mdio_priv = bus->priv;
 	mdio_priv->hw = hw;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
index 9f6c4f5c0a6c..bc012deedab4 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
@@ -848,8 +848,10 @@ static int enetc_mdio_probe(struct enetc_pf *pf, struct device_node *np)
 		return -ENOMEM;
 
 	bus->name = "Freescale ENETC MDIO Bus";
-	bus->read = enetc_mdio_read;
-	bus->write = enetc_mdio_write;
+	bus->read = enetc_mdio_read_c22;
+	bus->write = enetc_mdio_write_c22;
+	bus->read_c45 = enetc_mdio_read_c45;
+	bus->write_c45 = enetc_mdio_write_c45;
 	bus->parent = dev;
 	mdio_priv = bus->priv;
 	mdio_priv->hw = &pf->si->hw;
@@ -885,8 +887,10 @@ static int enetc_imdio_create(struct enetc_pf *pf)
 		return -ENOMEM;
 
 	bus->name = "Freescale ENETC internal MDIO Bus";
-	bus->read = enetc_mdio_read;
-	bus->write = enetc_mdio_write;
+	bus->read = enetc_mdio_read_c22;
+	bus->write = enetc_mdio_write_c22;
+	bus->read_c45 = enetc_mdio_read_c45;
+	bus->write_c45 = enetc_mdio_write_c45;
 	bus->parent = dev;
 	bus->phy_mask = ~0;
 	mdio_priv = bus->priv;
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index e3de9a53b2d9..dc50e0b227a6 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -215,8 +215,8 @@ static int mtk_mdio_busy_wait(struct mtk_eth *eth)
 	return -ETIMEDOUT;
 }
 
-static int _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg,
-			   u32 write_data)
+static int _mtk_mdio_write_c22(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg,
+			       u32 write_data)
 {
 	int ret;
 
@@ -224,35 +224,13 @@ static int _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg,
 	if (ret < 0)
 		return ret;
 
-	if (phy_reg & MII_ADDR_C45) {
-		mtk_w32(eth, PHY_IAC_ACCESS |
-			     PHY_IAC_START_C45 |
-			     PHY_IAC_CMD_C45_ADDR |
-			     PHY_IAC_REG(mdiobus_c45_devad(phy_reg)) |
-			     PHY_IAC_ADDR(phy_addr) |
-			     PHY_IAC_DATA(mdiobus_c45_regad(phy_reg)),
-			MTK_PHY_IAC);
-
-		ret = mtk_mdio_busy_wait(eth);
-		if (ret < 0)
-			return ret;
-
-		mtk_w32(eth, PHY_IAC_ACCESS |
-			     PHY_IAC_START_C45 |
-			     PHY_IAC_CMD_WRITE |
-			     PHY_IAC_REG(mdiobus_c45_devad(phy_reg)) |
-			     PHY_IAC_ADDR(phy_addr) |
-			     PHY_IAC_DATA(write_data),
-			MTK_PHY_IAC);
-	} else {
-		mtk_w32(eth, PHY_IAC_ACCESS |
-			     PHY_IAC_START_C22 |
-			     PHY_IAC_CMD_WRITE |
-			     PHY_IAC_REG(phy_reg) |
-			     PHY_IAC_ADDR(phy_addr) |
-			     PHY_IAC_DATA(write_data),
-			MTK_PHY_IAC);
-	}
+	mtk_w32(eth, PHY_IAC_ACCESS |
+		PHY_IAC_START_C22 |
+		PHY_IAC_CMD_WRITE |
+		PHY_IAC_REG(phy_reg) |
+		PHY_IAC_ADDR(phy_addr) |
+		PHY_IAC_DATA(write_data),
+		MTK_PHY_IAC);
 
 	ret = mtk_mdio_busy_wait(eth);
 	if (ret < 0)
@@ -261,7 +239,8 @@ static int _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg,
 	return 0;
 }
 
-static int _mtk_mdio_read(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg)
+static int _mtk_mdio_write_c45(struct mtk_eth *eth, u32 phy_addr,
+			       u32 devad, u32 phy_reg, u32 write_data)
 {
 	int ret;
 
@@ -269,33 +248,82 @@ static int _mtk_mdio_read(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg)
 	if (ret < 0)
 		return ret;
 
-	if (phy_reg & MII_ADDR_C45) {
-		mtk_w32(eth, PHY_IAC_ACCESS |
-			     PHY_IAC_START_C45 |
-			     PHY_IAC_CMD_C45_ADDR |
-			     PHY_IAC_REG(mdiobus_c45_devad(phy_reg)) |
-			     PHY_IAC_ADDR(phy_addr) |
-			     PHY_IAC_DATA(mdiobus_c45_regad(phy_reg)),
-			MTK_PHY_IAC);
-
-		ret = mtk_mdio_busy_wait(eth);
-		if (ret < 0)
-			return ret;
-
-		mtk_w32(eth, PHY_IAC_ACCESS |
-			     PHY_IAC_START_C45 |
-			     PHY_IAC_CMD_C45_READ |
-			     PHY_IAC_REG(mdiobus_c45_devad(phy_reg)) |
-			     PHY_IAC_ADDR(phy_addr),
-			MTK_PHY_IAC);
-	} else {
-		mtk_w32(eth, PHY_IAC_ACCESS |
-			     PHY_IAC_START_C22 |
-			     PHY_IAC_CMD_C22_READ |
-			     PHY_IAC_REG(phy_reg) |
-			     PHY_IAC_ADDR(phy_addr),
-			MTK_PHY_IAC);
-	}
+	mtk_w32(eth, PHY_IAC_ACCESS |
+		PHY_IAC_START_C45 |
+		PHY_IAC_CMD_C45_ADDR |
+		PHY_IAC_REG(devad) |
+		PHY_IAC_ADDR(phy_addr) |
+		PHY_IAC_DATA(phy_reg),
+		MTK_PHY_IAC);
+
+	ret = mtk_mdio_busy_wait(eth);
+	if (ret < 0)
+		return ret;
+
+	mtk_w32(eth, PHY_IAC_ACCESS |
+		PHY_IAC_START_C45 |
+		PHY_IAC_CMD_WRITE |
+		PHY_IAC_REG(devad) |
+		PHY_IAC_ADDR(phy_addr) |
+		PHY_IAC_DATA(write_data),
+		MTK_PHY_IAC);
+
+	ret = mtk_mdio_busy_wait(eth);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int _mtk_mdio_read_c22(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg)
+{
+	int ret;
+
+	ret = mtk_mdio_busy_wait(eth);
+	if (ret < 0)
+		return ret;
+
+	mtk_w32(eth, PHY_IAC_ACCESS |
+		PHY_IAC_START_C22 |
+		PHY_IAC_CMD_C22_READ |
+		PHY_IAC_REG(phy_reg) |
+		PHY_IAC_ADDR(phy_addr),
+		MTK_PHY_IAC);
+
+	ret = mtk_mdio_busy_wait(eth);
+	if (ret < 0)
+		return ret;
+
+	return mtk_r32(eth, MTK_PHY_IAC) & PHY_IAC_DATA_MASK;
+}
+
+static int _mtk_mdio_read_c45(struct mtk_eth *eth, u32 phy_addr,
+			      u32 devad, u32 phy_reg)
+{
+	int ret;
+
+	ret = mtk_mdio_busy_wait(eth);
+	if (ret < 0)
+		return ret;
+
+	mtk_w32(eth, PHY_IAC_ACCESS |
+		PHY_IAC_START_C45 |
+		PHY_IAC_CMD_C45_ADDR |
+		PHY_IAC_REG(devad) |
+		PHY_IAC_ADDR(phy_addr) |
+		PHY_IAC_DATA(phy_reg),
+		MTK_PHY_IAC);
+
+	ret = mtk_mdio_busy_wait(eth);
+	if (ret < 0)
+		return ret;
+
+	mtk_w32(eth, PHY_IAC_ACCESS |
+		PHY_IAC_START_C45 |
+		PHY_IAC_CMD_C45_READ |
+		PHY_IAC_REG(devad) |
+		PHY_IAC_ADDR(phy_addr),
+		MTK_PHY_IAC);
 
 	ret = mtk_mdio_busy_wait(eth);
 	if (ret < 0)
@@ -304,19 +332,35 @@ static int _mtk_mdio_read(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg)
 	return mtk_r32(eth, MTK_PHY_IAC) & PHY_IAC_DATA_MASK;
 }
 
-static int mtk_mdio_write(struct mii_bus *bus, int phy_addr,
-			  int phy_reg, u16 val)
+static int mtk_mdio_write_c22(struct mii_bus *bus, int phy_addr,
+			      int phy_reg, u16 val)
+{
+	struct mtk_eth *eth = bus->priv;
+
+	return _mtk_mdio_write_c22(eth, phy_addr, phy_reg, val);
+}
+
+static int mtk_mdio_write_c45(struct mii_bus *bus, int phy_addr,
+			      int devad, int phy_reg, u16 val)
+{
+	struct mtk_eth *eth = bus->priv;
+
+	return _mtk_mdio_write_c45(eth, phy_addr, devad, phy_reg, val);
+}
+
+static int mtk_mdio_read_c22(struct mii_bus *bus, int phy_addr, int phy_reg)
 {
 	struct mtk_eth *eth = bus->priv;
 
-	return _mtk_mdio_write(eth, phy_addr, phy_reg, val);
+	return _mtk_mdio_read_c22(eth, phy_addr, phy_reg);
 }
 
-static int mtk_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg)
+static int mtk_mdio_read_c45(struct mii_bus *bus, int phy_addr, int devad,
+			     int phy_reg)
 {
 	struct mtk_eth *eth = bus->priv;
 
-	return _mtk_mdio_read(eth, phy_addr, phy_reg);
+	return _mtk_mdio_read_c45(eth, phy_addr, devad, phy_reg);
 }
 
 static int mt7621_gmac0_rgmii_adjust(struct mtk_eth *eth,
@@ -760,8 +804,10 @@ static int mtk_mdio_init(struct mtk_eth *eth)
 	}
 
 	eth->mii_bus->name = "mdio";
-	eth->mii_bus->read = mtk_mdio_read;
-	eth->mii_bus->write = mtk_mdio_write;
+	eth->mii_bus->read = mtk_mdio_read_c22;
+	eth->mii_bus->write = mtk_mdio_write_c22;
+	eth->mii_bus->read_c45 = mtk_mdio_read_c45;
+	eth->mii_bus->write_c45 = mtk_mdio_write_c45;
 	eth->mii_bus->probe_capabilities = MDIOBUS_C22_C45;
 	eth->mii_bus->priv = eth;
 	eth->mii_bus->parent = eth->dev;
diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index 534840f9a7ca..e205edf477de 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -792,7 +792,7 @@ static int lan743x_mac_mii_wait_till_not_busy(struct lan743x_adapter *adapter)
 				  !(data & MAC_MII_ACC_MII_BUSY_), 0, 1000000);
 }
 
-static int lan743x_mdiobus_read(struct mii_bus *bus, int phy_id, int index)
+static int lan743x_mdiobus_read_c22(struct mii_bus *bus, int phy_id, int index)
 {
 	struct lan743x_adapter *adapter = bus->priv;
 	u32 val, mii_access;
@@ -814,8 +814,8 @@ static int lan743x_mdiobus_read(struct mii_bus *bus, int phy_id, int index)
 	return (int)(val & 0xFFFF);
 }
 
-static int lan743x_mdiobus_write(struct mii_bus *bus,
-				 int phy_id, int index, u16 regval)
+static int lan743x_mdiobus_write_c22(struct mii_bus *bus,
+				     int phy_id, int index, u16 regval)
 {
 	struct lan743x_adapter *adapter = bus->priv;
 	u32 val, mii_access;
@@ -835,12 +835,10 @@ static int lan743x_mdiobus_write(struct mii_bus *bus,
 	return ret;
 }
 
-static u32 lan743x_mac_mmd_access(int id, int index, int op)
+static u32 lan743x_mac_mmd_access(int id, int dev_addr, int op)
 {
-	u16 dev_addr;
 	u32 ret;
 
-	dev_addr = (index >> 16) & 0x1f;
 	ret = (id << MAC_MII_ACC_PHY_ADDR_SHIFT_) &
 		MAC_MII_ACC_PHY_ADDR_MASK_;
 	ret |= (dev_addr << MAC_MII_ACC_MIIMMD_SHIFT_) &
@@ -858,7 +856,8 @@ static u32 lan743x_mac_mmd_access(int id, int index, int op)
 	return ret;
 }
 
-static int lan743x_mdiobus_c45_read(struct mii_bus *bus, int phy_id, int index)
+static int lan743x_mdiobus_read_c45(struct mii_bus *bus, int phy_id,
+				    int dev_addr, int index)
 {
 	struct lan743x_adapter *adapter = bus->priv;
 	u32 mmd_access;
@@ -868,32 +867,30 @@ static int lan743x_mdiobus_c45_read(struct mii_bus *bus, int phy_id, int index)
 	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
 	if (ret < 0)
 		return ret;
-	if (index & MII_ADDR_C45) {
-		/* Load Register Address */
-		lan743x_csr_write(adapter, MAC_MII_DATA, (u32)(index & 0xffff));
-		mmd_access = lan743x_mac_mmd_access(phy_id, index,
-						    MMD_ACCESS_ADDRESS);
-		lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
-		ret = lan743x_mac_mii_wait_till_not_busy(adapter);
-		if (ret < 0)
-			return ret;
-		/* Read Data */
-		mmd_access = lan743x_mac_mmd_access(phy_id, index,
-						    MMD_ACCESS_READ);
-		lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
-		ret = lan743x_mac_mii_wait_till_not_busy(adapter);
-		if (ret < 0)
-			return ret;
-		ret = lan743x_csr_read(adapter, MAC_MII_DATA);
-		return (int)(ret & 0xFFFF);
-	}
 
-	ret = lan743x_mdiobus_read(bus, phy_id, index);
-	return ret;
+	/* Load Register Address */
+	lan743x_csr_write(adapter, MAC_MII_DATA, index);
+	mmd_access = lan743x_mac_mmd_access(phy_id, dev_addr,
+					    MMD_ACCESS_ADDRESS);
+	lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
+	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
+	if (ret < 0)
+		return ret;
+
+	/* Read Data */
+	mmd_access = lan743x_mac_mmd_access(phy_id, dev_addr,
+					    MMD_ACCESS_READ);
+	lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
+	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
+	if (ret < 0)
+		return ret;
+
+	ret = lan743x_csr_read(adapter, MAC_MII_DATA);
+	return (int)(ret & 0xFFFF);
 }
 
-static int lan743x_mdiobus_c45_write(struct mii_bus *bus,
-				     int phy_id, int index, u16 regval)
+static int lan743x_mdiobus_write_c45(struct mii_bus *bus, int phy_id,
+				     int dev_addr, int index, u16 regval)
 {
 	struct lan743x_adapter *adapter = bus->priv;
 	u32 mmd_access;
@@ -903,26 +900,23 @@ static int lan743x_mdiobus_c45_write(struct mii_bus *bus,
 	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
 	if (ret < 0)
 		return ret;
-	if (index & MII_ADDR_C45) {
-		/* Load Register Address */
-		lan743x_csr_write(adapter, MAC_MII_DATA, (u32)(index & 0xffff));
-		mmd_access = lan743x_mac_mmd_access(phy_id, index,
-						    MMD_ACCESS_ADDRESS);
-		lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
-		ret = lan743x_mac_mii_wait_till_not_busy(adapter);
-		if (ret < 0)
-			return ret;
-		/* Write Data */
-		lan743x_csr_write(adapter, MAC_MII_DATA, (u32)regval);
-		mmd_access = lan743x_mac_mmd_access(phy_id, index,
-						    MMD_ACCESS_WRITE);
-		lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
-		ret = lan743x_mac_mii_wait_till_not_busy(adapter);
-	} else {
-		ret = lan743x_mdiobus_write(bus, phy_id, index, regval);
-	}
 
-	return ret;
+	/* Load Register Address */
+	lan743x_csr_write(adapter, MAC_MII_DATA, (u32)index);
+	mmd_access = lan743x_mac_mmd_access(phy_id, dev_addr,
+					    MMD_ACCESS_ADDRESS);
+	lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
+	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
+	if (ret < 0)
+		return ret;
+
+	/* Write Data */
+	lan743x_csr_write(adapter, MAC_MII_DATA, (u32)regval);
+	mmd_access = lan743x_mac_mmd_access(phy_id, dev_addr,
+					    MMD_ACCESS_WRITE);
+	lan743x_csr_write(adapter, MAC_MII_ACC, mmd_access);
+
+	return lan743x_mac_mii_wait_till_not_busy(adapter);
 }
 
 static int lan743x_sgmii_wait_till_not_busy(struct lan743x_adapter *adapter)
@@ -3286,8 +3280,10 @@ static int lan743x_mdiobus_init(struct lan743x_adapter *adapter)
 			netif_dbg(adapter, drv, adapter->netdev,
 				  "SGMII operation\n");
 			adapter->mdiobus->probe_capabilities = MDIOBUS_C22_C45;
-			adapter->mdiobus->read = lan743x_mdiobus_c45_read;
-			adapter->mdiobus->write = lan743x_mdiobus_c45_write;
+			adapter->mdiobus->read = lan743x_mdiobus_read_c22;
+			adapter->mdiobus->write = lan743x_mdiobus_write_c22;
+			adapter->mdiobus->read_c45 = lan743x_mdiobus_read_c45;
+			adapter->mdiobus->write_c45 = lan743x_mdiobus_write_c45;
 			adapter->mdiobus->name = "lan743x-mdiobus-c45";
 			netif_dbg(adapter, drv, adapter->netdev,
 				  "lan743x-mdiobus-c45\n");
@@ -3300,15 +3296,15 @@ static int lan743x_mdiobus_init(struct lan743x_adapter *adapter)
 				  "RGMII operation\n");
 			// Only C22 support when RGMII I/F
 			adapter->mdiobus->probe_capabilities = MDIOBUS_C22;
-			adapter->mdiobus->read = lan743x_mdiobus_read;
-			adapter->mdiobus->write = lan743x_mdiobus_write;
+			adapter->mdiobus->read = lan743x_mdiobus_read_c22;
+			adapter->mdiobus->write = lan743x_mdiobus_write_c22;
 			adapter->mdiobus->name = "lan743x-mdiobus";
 			netif_dbg(adapter, drv, adapter->netdev,
 				  "lan743x-mdiobus\n");
 		}
 	} else {
-		adapter->mdiobus->read = lan743x_mdiobus_read;
-		adapter->mdiobus->write = lan743x_mdiobus_write;
+		adapter->mdiobus->read = lan743x_mdiobus_read_c22;
+		adapter->mdiobus->write = lan743x_mdiobus_write_c22;
 		adapter->mdiobus->name = "lan743x-mdiobus";
 		netif_dbg(adapter, drv, adapter->netdev, "lan743x-mdiobus\n");
 	}
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 5f177ea80725..d2cb22f49ce5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -45,8 +45,8 @@
 #define MII_XGMAC_PA_SHIFT		16
 #define MII_XGMAC_DA_SHIFT		21
 
-static int stmmac_xgmac2_c45_format(struct stmmac_priv *priv, int phyaddr,
-				    int phyreg, u32 *hw_addr)
+static void stmmac_xgmac2_c45_format(struct stmmac_priv *priv, int phyaddr,
+				     int devad, int phyreg, u32 *hw_addr)
 {
 	u32 tmp;
 
@@ -56,19 +56,14 @@ static int stmmac_xgmac2_c45_format(struct stmmac_priv *priv, int phyaddr,
 	writel(tmp, priv->ioaddr + XGMAC_MDIO_C22P);
 
 	*hw_addr = (phyaddr << MII_XGMAC_PA_SHIFT) | (phyreg & 0xffff);
-	*hw_addr |= (phyreg >> MII_DEVADDR_C45_SHIFT) << MII_XGMAC_DA_SHIFT;
-	return 0;
+	*hw_addr |= devad << MII_XGMAC_DA_SHIFT;
 }
 
-static int stmmac_xgmac2_c22_format(struct stmmac_priv *priv, int phyaddr,
-				    int phyreg, u32 *hw_addr)
+static void stmmac_xgmac2_c22_format(struct stmmac_priv *priv, int phyaddr,
+				     int phyreg, u32 *hw_addr)
 {
 	u32 tmp;
 
-	/* HW does not support C22 addr >= 4 */
-	if (phyaddr > MII_XGMAC_MAX_C22ADDR)
-		return -ENODEV;
-
 	/* Set port as Clause 22 */
 	tmp = readl(priv->ioaddr + XGMAC_MDIO_C22P);
 	tmp &= ~MII_XGMAC_C22P_MASK;
@@ -76,16 +71,14 @@ static int stmmac_xgmac2_c22_format(struct stmmac_priv *priv, int phyaddr,
 	writel(tmp, priv->ioaddr + XGMAC_MDIO_C22P);
 
 	*hw_addr = (phyaddr << MII_XGMAC_PA_SHIFT) | (phyreg & 0x1f);
-	return 0;
 }
 
-static int stmmac_xgmac2_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
+static int stmmac_xgmac2_mdio_read(struct stmmac_priv *priv, u32 addr,
+				   u32 value)
 {
-	struct net_device *ndev = bus->priv;
-	struct stmmac_priv *priv = netdev_priv(ndev);
 	unsigned int mii_address = priv->hw->mii.addr;
 	unsigned int mii_data = priv->hw->mii.data;
-	u32 tmp, addr, value = MII_XGMAC_BUSY;
+	u32 tmp;
 	int ret;
 
 	ret = pm_runtime_resume_and_get(priv->device);
@@ -99,20 +92,6 @@ static int stmmac_xgmac2_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
 		goto err_disable_clks;
 	}
 
-	if (phyreg & MII_ADDR_C45) {
-		phyreg &= ~MII_ADDR_C45;
-
-		ret = stmmac_xgmac2_c45_format(priv, phyaddr, phyreg, &addr);
-		if (ret)
-			goto err_disable_clks;
-	} else {
-		ret = stmmac_xgmac2_c22_format(priv, phyaddr, phyreg, &addr);
-		if (ret)
-			goto err_disable_clks;
-
-		value |= MII_XGMAC_SADDR;
-	}
-
 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
 		& priv->hw->mii.clk_csr_mask;
 	value |= MII_XGMAC_READ;
@@ -144,14 +123,44 @@ err_disable_clks:
 	return ret;
 }
 
-static int stmmac_xgmac2_mdio_write(struct mii_bus *bus, int phyaddr,
-				    int phyreg, u16 phydata)
+static int stmmac_xgmac2_mdio_read_c22(struct mii_bus *bus, int phyaddr,
+				       int phyreg)
 {
 	struct net_device *ndev = bus->priv;
-	struct stmmac_priv *priv = netdev_priv(ndev);
+	struct stmmac_priv *priv;
+	u32 addr;
+
+	priv = netdev_priv(ndev);
+
+	/* HW does not support C22 addr >= 4 */
+	if (phyaddr > MII_XGMAC_MAX_C22ADDR)
+		return -ENODEV;
+
+	stmmac_xgmac2_c22_format(priv, phyaddr, phyreg, &addr);
+
+	return stmmac_xgmac2_mdio_read(priv, addr, MII_XGMAC_BUSY);
+}
+
+static int stmmac_xgmac2_mdio_read_c45(struct mii_bus *bus, int phyaddr,
+				       int devad, int phyreg)
+{
+	struct net_device *ndev = bus->priv;
+	struct stmmac_priv *priv;
+	u32 addr;
+
+	priv = netdev_priv(ndev);
+
+	stmmac_xgmac2_c45_format(priv, phyaddr, devad, phyreg, &addr);
+
+	return stmmac_xgmac2_mdio_read(priv, addr, MII_XGMAC_BUSY);
+}
+
+static int stmmac_xgmac2_mdio_write(struct stmmac_priv *priv, u32 addr,
+				    u32 value, u16 phydata)
+{
 	unsigned int mii_address = priv->hw->mii.addr;
 	unsigned int mii_data = priv->hw->mii.data;
-	u32 addr, tmp, value = MII_XGMAC_BUSY;
+	u32 tmp;
 	int ret;
 
 	ret = pm_runtime_resume_and_get(priv->device);
@@ -165,20 +174,6 @@ static int stmmac_xgmac2_mdio_write(struct mii_bus *bus, int phyaddr,
 		goto err_disable_clks;
 	}
 
-	if (phyreg & MII_ADDR_C45) {
-		phyreg &= ~MII_ADDR_C45;
-
-		ret = stmmac_xgmac2_c45_format(priv, phyaddr, phyreg, &addr);
-		if (ret)
-			goto err_disable_clks;
-	} else {
-		ret = stmmac_xgmac2_c22_format(priv, phyaddr, phyreg, &addr);
-		if (ret)
-			goto err_disable_clks;
-
-		value |= MII_XGMAC_SADDR;
-	}
-
 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
 		& priv->hw->mii.clk_csr_mask;
 	value |= phydata;
@@ -205,8 +200,63 @@ err_disable_clks:
 	return ret;
 }
 
+static int stmmac_xgmac2_mdio_write_c22(struct mii_bus *bus, int phyaddr,
+					int phyreg, u16 phydata)
+{
+	struct net_device *ndev = bus->priv;
+	struct stmmac_priv *priv;
+	u32 addr;
+
+	priv = netdev_priv(ndev);
+
+	/* HW does not support C22 addr >= 4 */
+	if (phyaddr > MII_XGMAC_MAX_C22ADDR)
+		return -ENODEV;
+
+	stmmac_xgmac2_c22_format(priv, phyaddr, phyreg, &addr);
+
+	return stmmac_xgmac2_mdio_write(priv, addr,
+					MII_XGMAC_BUSY | MII_XGMAC_SADDR, phydata);
+}
+
+static int stmmac_xgmac2_mdio_write_c45(struct mii_bus *bus, int phyaddr,
+					int devad, int phyreg, u16 phydata)
+{
+	struct net_device *ndev = bus->priv;
+	struct stmmac_priv *priv;
+	u32 addr;
+
+	priv = netdev_priv(ndev);
+
+	stmmac_xgmac2_c45_format(priv, phyaddr, devad, phyreg, &addr);
+
+	return stmmac_xgmac2_mdio_write(priv, addr, MII_XGMAC_BUSY,
+					phydata);
+}
+
+static int stmmac_mdio_read(struct stmmac_priv *priv, int data, u32 value)
+{
+	unsigned int mii_address = priv->hw->mii.addr;
+	unsigned int mii_data = priv->hw->mii.data;
+	u32 v;
+
+	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
+			       100, 10000))
+		return -EBUSY;
+
+	writel(data, priv->ioaddr + mii_data);
+	writel(value, priv->ioaddr + mii_address);
+
+	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
+			       100, 10000))
+		return -EBUSY;
+
+	/* Read the data from the MII data register */
+	return readl(priv->ioaddr + mii_data) & MII_DATA_MASK;
+}
+
 /**
- * stmmac_mdio_read
+ * stmmac_mdio_read_c22
  * @bus: points to the mii_bus structure
  * @phyaddr: MII addr
  * @phyreg: MII reg
@@ -215,15 +265,12 @@ err_disable_clks:
  * accessing the PHY registers.
  * Fortunately, it seems this has no drawback for the 7109 MAC.
  */
-static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
+static int stmmac_mdio_read_c22(struct mii_bus *bus, int phyaddr, int phyreg)
 {
 	struct net_device *ndev = bus->priv;
 	struct stmmac_priv *priv = netdev_priv(ndev);
-	unsigned int mii_address = priv->hw->mii.addr;
-	unsigned int mii_data = priv->hw->mii.data;
 	u32 value = MII_BUSY;
 	int data = 0;
-	u32 v;
 
 	data = pm_runtime_resume_and_get(priv->device);
 	if (data < 0)
@@ -236,60 +283,94 @@ static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
 		& priv->hw->mii.clk_csr_mask;
 	if (priv->plat->has_gmac4) {
 		value |= MII_GMAC4_READ;
-		if (phyreg & MII_ADDR_C45) {
-			value |= MII_GMAC4_C45E;
-			value &= ~priv->hw->mii.reg_mask;
-			value |= ((phyreg >> MII_DEVADDR_C45_SHIFT) <<
-			       priv->hw->mii.reg_shift) &
-			       priv->hw->mii.reg_mask;
-
-			data |= (phyreg & MII_REGADDR_C45_MASK) <<
-				MII_GMAC4_REG_ADDR_SHIFT;
-		}
 	}
 
-	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
-			       100, 10000)) {
-		data = -EBUSY;
-		goto err_disable_clks;
-	}
+	data = stmmac_mdio_read(priv, data, value);
 
-	writel(data, priv->ioaddr + mii_data);
-	writel(value, priv->ioaddr + mii_address);
+	pm_runtime_put(priv->device);
 
-	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
-			       100, 10000)) {
-		data = -EBUSY;
-		goto err_disable_clks;
+	return data;
+}
+
+/**
+ * stmmac_mdio_read_c45
+ * @bus: points to the mii_bus structure
+ * @phyaddr: MII addr
+ * @devad: device address to read
+ * @phyreg: MII reg
+ * Description: it reads data from the MII register from within the phy device.
+ * For the 7111 GMAC, we must set the bit 0 in the MII address register while
+ * accessing the PHY registers.
+ * Fortunately, it seems this has no drawback for the 7109 MAC.
+ */
+static int stmmac_mdio_read_c45(struct mii_bus *bus, int phyaddr, int devad,
+				int phyreg)
+{
+	struct net_device *ndev = bus->priv;
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	u32 value = MII_BUSY;
+	int data = 0;
+
+	data = pm_runtime_get_sync(priv->device);
+	if (data < 0) {
+		pm_runtime_put_noidle(priv->device);
+		return data;
 	}
 
-	/* Read the data from the MII data register */
-	data = (int)readl(priv->ioaddr + mii_data) & MII_DATA_MASK;
+	value |= (phyaddr << priv->hw->mii.addr_shift)
+		& priv->hw->mii.addr_mask;
+	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
+	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
+		& priv->hw->mii.clk_csr_mask;
+	value |= MII_GMAC4_READ;
+	value |= MII_GMAC4_C45E;
+	value &= ~priv->hw->mii.reg_mask;
+	value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
+
+	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;
+
+	data = stmmac_mdio_read(priv, data, value);
 
-err_disable_clks:
 	pm_runtime_put(priv->device);
 
 	return data;
 }
 
+static int stmmac_mdio_write(struct stmmac_priv *priv, int data, u32 value)
+{
+	unsigned int mii_address = priv->hw->mii.addr;
+	unsigned int mii_data = priv->hw->mii.data;
+	u32 v;
+
+	/* Wait until any existing MII operation is complete */
+	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
+			       100, 10000))
+		return -EBUSY;
+
+	/* Set the MII address register to write */
+	writel(data, priv->ioaddr + mii_data);
+	writel(value, priv->ioaddr + mii_address);
+
+	/* Wait until any existing MII operation is complete */
+	return readl_poll_timeout(priv->ioaddr + mii_address, v,
+				  !(v & MII_BUSY), 100, 10000);
+}
+
 /**
- * stmmac_mdio_write
+ * stmmac_mdio_write_c22
  * @bus: points to the mii_bus structure
  * @phyaddr: MII addr
  * @phyreg: MII reg
  * @phydata: phy data
  * Description: it writes the data into the MII register from within the device.
  */
-static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
-			     u16 phydata)
+static int stmmac_mdio_write_c22(struct mii_bus *bus, int phyaddr, int phyreg,
+				 u16 phydata)
 {
 	struct net_device *ndev = bus->priv;
 	struct stmmac_priv *priv = netdev_priv(ndev);
-	unsigned int mii_address = priv->hw->mii.addr;
-	unsigned int mii_data = priv->hw->mii.data;
 	int ret, data = phydata;
 	u32 value = MII_BUSY;
-	u32 v;
 
 	ret = pm_runtime_resume_and_get(priv->device);
 	if (ret < 0)
@@ -301,38 +382,57 @@ static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
 
 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
 		& priv->hw->mii.clk_csr_mask;
-	if (priv->plat->has_gmac4) {
+	if (priv->plat->has_gmac4)
 		value |= MII_GMAC4_WRITE;
-		if (phyreg & MII_ADDR_C45) {
-			value |= MII_GMAC4_C45E;
-			value &= ~priv->hw->mii.reg_mask;
-			value |= ((phyreg >> MII_DEVADDR_C45_SHIFT) <<
-			       priv->hw->mii.reg_shift) &
-			       priv->hw->mii.reg_mask;
-
-			data |= (phyreg & MII_REGADDR_C45_MASK) <<
-				MII_GMAC4_REG_ADDR_SHIFT;
-		}
-	} else {
+	else
 		value |= MII_WRITE;
-	}
 
-	/* Wait until any existing MII operation is complete */
-	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
-			       100, 10000)) {
-		ret = -EBUSY;
-		goto err_disable_clks;
+	ret = stmmac_mdio_write(priv, data, value);
+
+	pm_runtime_put(priv->device);
+
+	return ret;
+}
+
+/**
+ * stmmac_mdio_write_c45
+ * @bus: points to the mii_bus structure
+ * @phyaddr: MII addr
+ * @phyreg: MII reg
+ * @devad: device address to read
+ * @phydata: phy data
+ * Description: it writes the data into the MII register from within the device.
+ */
+static int stmmac_mdio_write_c45(struct mii_bus *bus, int phyaddr,
+				 int devad, int phyreg, u16 phydata)
+{
+	struct net_device *ndev = bus->priv;
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	int ret, data = phydata;
+	u32 value = MII_BUSY;
+
+	ret = pm_runtime_get_sync(priv->device);
+	if (ret < 0) {
+		pm_runtime_put_noidle(priv->device);
+		return ret;
 	}
 
-	/* Set the MII address register to write */
-	writel(data, priv->ioaddr + mii_data);
-	writel(value, priv->ioaddr + mii_address);
+	value |= (phyaddr << priv->hw->mii.addr_shift)
+		& priv->hw->mii.addr_mask;
+	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 
-	/* Wait until any existing MII operation is complete */
-	ret = readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
-				 100, 10000);
+	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
+		& priv->hw->mii.clk_csr_mask;
+
+	value |= MII_GMAC4_WRITE;
+	value |= MII_GMAC4_C45E;
+	value &= ~priv->hw->mii.reg_mask;
+	value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
+
+	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;
+
+	ret = stmmac_mdio_write(priv, data, value);
 
-err_disable_clks:
 	pm_runtime_put(priv->device);
 
 	return ret;
@@ -457,8 +557,10 @@ int stmmac_mdio_register(struct net_device *ndev)
 		new_bus->probe_capabilities = MDIOBUS_C22_C45;
 
 	if (priv->plat->has_xgmac) {
-		new_bus->read = &stmmac_xgmac2_mdio_read;
-		new_bus->write = &stmmac_xgmac2_mdio_write;
+		new_bus->read = &stmmac_xgmac2_mdio_read_c22;
+		new_bus->write = &stmmac_xgmac2_mdio_write_c22;
+		new_bus->read_c45 = &stmmac_xgmac2_mdio_read_c45;
+		new_bus->write_c45 = &stmmac_xgmac2_mdio_write_c45;
 
 		/* Right now only C22 phys are supported */
 		max_addr = MII_XGMAC_MAX_C22ADDR + 1;
@@ -468,8 +570,13 @@ int stmmac_mdio_register(struct net_device *ndev)
 			dev_err(dev, "Unsupported phy_addr (max=%d)\n",
 					MII_XGMAC_MAX_C22ADDR);
 	} else {
-		new_bus->read = &stmmac_mdio_read;
-		new_bus->write = &stmmac_mdio_write;
+		new_bus->read = &stmmac_mdio_read_c22;
+		new_bus->write = &stmmac_mdio_write_c22;
+		if (priv->plat->has_gmac4) {
+			new_bus->read_c45 = &stmmac_mdio_read_c45;
+			new_bus->write_c45 = &stmmac_mdio_write_c45;
+		}
+
 		max_addr = PHY_MAX_ADDR;
 	}
 
@@ -490,7 +597,7 @@ int stmmac_mdio_register(struct net_device *ndev)
 
 	/* Looks like we need a dummy read for XGMAC only and C45 PHYs */
 	if (priv->plat->has_xgmac)
-		stmmac_xgmac2_mdio_read(new_bus, 0, MII_ADDR_C45);
+		stmmac_xgmac2_mdio_read_c45(new_bus, 0, 0, 0);
 
 	/* If fixed-link is set, skip PHY scanning */
 	if (!fwnode)
diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-aspeed.c
index 944d005d2bd1..2f4bbda5e56c 100644
--- a/drivers/net/mdio/mdio-aspeed.c
+++ b/drivers/net/mdio/mdio-aspeed.c
@@ -104,61 +104,36 @@ static int aspeed_mdio_write_c22(struct mii_bus *bus, int addr, int regnum,
 			      addr, regnum, val);
 }
 
-static int aspeed_mdio_read_c45(struct mii_bus *bus, int addr, int regnum)
+static int aspeed_mdio_read_c45(struct mii_bus *bus, int addr, int devad,
+				int regnum)
 {
-	u8 c45_dev = (regnum >> 16) & 0x1F;
-	u16 c45_addr = regnum & 0xFFFF;
 	int rc;
 
 	rc = aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_ADDR,
-			    addr, c45_dev, c45_addr);
+			    addr, devad, regnum);
 	if (rc < 0)
 		return rc;
 
 	rc = aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_READ,
-			    addr, c45_dev, 0);
+			    addr, devad, 0);
 	if (rc < 0)
 		return rc;
 
 	return aspeed_mdio_get_data(bus);
 }
 
-static int aspeed_mdio_write_c45(struct mii_bus *bus, int addr, int regnum,
-				 u16 val)
+static int aspeed_mdio_write_c45(struct mii_bus *bus, int addr, int devad,
+				 int regnum, u16 val)
 {
-	u8 c45_dev = (regnum >> 16) & 0x1F;
-	u16 c45_addr = regnum & 0xFFFF;
 	int rc;
 
 	rc = aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_ADDR,
-			    addr, c45_dev, c45_addr);
+			    addr, devad, regnum);
 	if (rc < 0)
 		return rc;
 
 	return aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_WRITE,
-			      addr, c45_dev, val);
-}
-
-static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
-{
-	dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d\n", __func__, addr,
-		regnum);
-
-	if (regnum & MII_ADDR_C45)
-		return aspeed_mdio_read_c45(bus, addr, regnum);
-
-	return aspeed_mdio_read_c22(bus, addr, regnum);
-}
-
-static int aspeed_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
-{
-	dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d, val: 0x%x\n",
-		__func__, addr, regnum, val);
-
-	if (regnum & MII_ADDR_C45)
-		return aspeed_mdio_write_c45(bus, addr, regnum, val);
-
-	return aspeed_mdio_write_c22(bus, addr, regnum, val);
+			      addr, devad, val);
 }
 
 static int aspeed_mdio_probe(struct platform_device *pdev)
@@ -185,8 +160,10 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
 	bus->name = DRV_NAME;
 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s%d", pdev->name, pdev->id);
 	bus->parent = &pdev->dev;
-	bus->read = aspeed_mdio_read;
-	bus->write = aspeed_mdio_write;
+	bus->read = aspeed_mdio_read_c22;
+	bus->write = aspeed_mdio_write_c22;
+	bus->read_c45 = aspeed_mdio_read_c45;
+	bus->write_c45 = aspeed_mdio_write_c45;
 	bus->probe_capabilities = MDIOBUS_C22_C45;
 
 	rc = of_mdiobus_register(bus, pdev->dev.of_node);
diff --git a/drivers/net/mdio/mdio-cavium.c b/drivers/net/mdio/mdio-cavium.c
index 95ce274c1be1..fd81546a4d3d 100644
--- a/drivers/net/mdio/mdio-cavium.c
+++ b/drivers/net/mdio/mdio-cavium.c
@@ -26,7 +26,7 @@ static void cavium_mdiobus_set_mode(struct cavium_mdiobus *p,
 }
 
 static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
-				   int phy_id, int regnum)
+				   int phy_id, int devad, int regnum)
 {
 	union cvmx_smix_cmd smi_cmd;
 	union cvmx_smix_wr_dat smi_wr;
@@ -38,12 +38,10 @@ static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
 	smi_wr.s.dat = regnum & 0xffff;
 	oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
 
-	regnum = (regnum >> 16) & 0x1f;
-
 	smi_cmd.u64 = 0;
 	smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_45_ADDRESS */
 	smi_cmd.s.phy_adr = phy_id;
-	smi_cmd.s.reg_adr = regnum;
+	smi_cmd.s.reg_adr = devad;
 	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
 
 	do {
@@ -59,28 +57,51 @@ static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
 	return 0;
 }
 
-int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
+int cavium_mdiobus_read_c22(struct mii_bus *bus, int phy_id, int regnum)
 {
 	struct cavium_mdiobus *p = bus->priv;
 	union cvmx_smix_cmd smi_cmd;
 	union cvmx_smix_rd_dat smi_rd;
-	unsigned int op = 1; /* MDIO_CLAUSE_22_READ */
 	int timeout = 1000;
 
-	if (regnum & MII_ADDR_C45) {
-		int r = cavium_mdiobus_c45_addr(p, phy_id, regnum);
+	cavium_mdiobus_set_mode(p, C22);
+
+	smi_cmd.u64 = 0;
+	smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */;
+	smi_cmd.s.phy_adr = phy_id;
+	smi_cmd.s.reg_adr = regnum;
+	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
+
+	do {
+		/* Wait 1000 clocks so we don't saturate the RSL bus
+		 * doing reads.
+		 */
+		__delay(1000);
+		smi_rd.u64 = oct_mdio_readq(p->register_base + SMI_RD_DAT);
+	} while (smi_rd.s.pending && --timeout);
+
+	if (smi_rd.s.val)
+		return smi_rd.s.dat;
+	else
+		return -EIO;
+}
+EXPORT_SYMBOL(cavium_mdiobus_read_c22);
 
-		if (r < 0)
-			return r;
+int cavium_mdiobus_read_c45(struct mii_bus *bus, int phy_id, int devad,
+			    int regnum)
+{
+	struct cavium_mdiobus *p = bus->priv;
+	union cvmx_smix_cmd smi_cmd;
+	union cvmx_smix_rd_dat smi_rd;
+	int timeout = 1000;
+	int r;
 
-		regnum = (regnum >> 16) & 0x1f;
-		op = 3; /* MDIO_CLAUSE_45_READ */
-	} else {
-		cavium_mdiobus_set_mode(p, C22);
-	}
+	r = cavium_mdiobus_c45_addr(p, phy_id, devad, regnum);
+	if (r < 0)
+		return r;
 
 	smi_cmd.u64 = 0;
-	smi_cmd.s.phy_op = op;
+	smi_cmd.s.phy_op = 3; /* MDIO_CLAUSE_45_READ */
 	smi_cmd.s.phy_adr = phy_id;
 	smi_cmd.s.reg_adr = regnum;
 	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
@@ -98,36 +119,64 @@ int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
 	else
 		return -EIO;
 }
-EXPORT_SYMBOL(cavium_mdiobus_read);
+EXPORT_SYMBOL(cavium_mdiobus_read_c45);
 
-int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
+int cavium_mdiobus_write_c22(struct mii_bus *bus, int phy_id, int regnum,
+			     u16 val)
 {
 	struct cavium_mdiobus *p = bus->priv;
 	union cvmx_smix_cmd smi_cmd;
 	union cvmx_smix_wr_dat smi_wr;
-	unsigned int op = 0; /* MDIO_CLAUSE_22_WRITE */
 	int timeout = 1000;
 
-	if (regnum & MII_ADDR_C45) {
-		int r = cavium_mdiobus_c45_addr(p, phy_id, regnum);
+	cavium_mdiobus_set_mode(p, C22);
 
-		if (r < 0)
-			return r;
+	smi_wr.u64 = 0;
+	smi_wr.s.dat = val;
+	oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
 
-		regnum = (regnum >> 16) & 0x1f;
-		op = 1; /* MDIO_CLAUSE_45_WRITE */
-	} else {
-		cavium_mdiobus_set_mode(p, C22);
-	}
+	smi_cmd.u64 = 0;
+	smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_22_WRITE */;
+	smi_cmd.s.phy_adr = phy_id;
+	smi_cmd.s.reg_adr = regnum;
+	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
+
+	do {
+		/* Wait 1000 clocks so we don't saturate the RSL bus
+		 * doing reads.
+		 */
+		__delay(1000);
+		smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
+	} while (smi_wr.s.pending && --timeout);
+
+	if (timeout <= 0)
+		return -EIO;
+
+	return 0;
+}
+EXPORT_SYMBOL(cavium_mdiobus_write_c22);
+
+int cavium_mdiobus_write_c45(struct mii_bus *bus, int phy_id, int devad,
+			     int regnum, u16 val)
+{
+	struct cavium_mdiobus *p = bus->priv;
+	union cvmx_smix_cmd smi_cmd;
+	union cvmx_smix_wr_dat smi_wr;
+	int timeout = 1000;
+	int r;
+
+	r = cavium_mdiobus_c45_addr(p, phy_id, devad, regnum);
+	if (r < 0)
+		return r;
 
 	smi_wr.u64 = 0;
 	smi_wr.s.dat = val;
 	oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
 
 	smi_cmd.u64 = 0;
-	smi_cmd.s.phy_op = op;
+	smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_45_WRITE */
 	smi_cmd.s.phy_adr = phy_id;
-	smi_cmd.s.reg_adr = regnum;
+	smi_cmd.s.reg_adr = devad;
 	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
 
 	do {
@@ -143,7 +192,7 @@ int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
 
 	return 0;
 }
-EXPORT_SYMBOL(cavium_mdiobus_write);
+EXPORT_SYMBOL(cavium_mdiobus_write_c45);
 
 MODULE_DESCRIPTION("Common code for OCTEON and Thunder MDIO bus drivers");
 MODULE_AUTHOR("David Daney");
diff --git a/drivers/net/mdio/mdio-cavium.h b/drivers/net/mdio/mdio-cavium.h
index a2245d436f5d..71b8e20cd664 100644
--- a/drivers/net/mdio/mdio-cavium.h
+++ b/drivers/net/mdio/mdio-cavium.h
@@ -114,5 +114,10 @@ static inline u64 oct_mdio_readq(void __iomem *addr)
 #define oct_mdio_readq(addr)		readq(addr)
 #endif
 
-int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum);
-int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val);
+int cavium_mdiobus_read_c22(struct mii_bus *bus, int phy_id, int regnum);
+int cavium_mdiobus_write_c22(struct mii_bus *bus, int phy_id, int regnum,
+			     u16 val);
+int cavium_mdiobus_read_c45(struct mii_bus *bus, int phy_id, int devad,
+			    int regnum);
+int cavium_mdiobus_write_c45(struct mii_bus *bus, int phy_id, int devad,
+			     int regnum, u16 val);
diff --git a/drivers/net/mdio/mdio-i2c.c b/drivers/net/mdio/mdio-i2c.c
index bf8bf5e20faf..9577a1842997 100644
--- a/drivers/net/mdio/mdio-i2c.c
+++ b/drivers/net/mdio/mdio-i2c.c
@@ -30,7 +30,8 @@ static unsigned int i2c_mii_phy_addr(int phy_id)
 	return phy_id + 0x40;
 }
 
-static int i2c_mii_read_default(struct mii_bus *bus, int phy_id, int reg)
+static int i2c_mii_read_default_c45(struct mii_bus *bus, int phy_id, int devad,
+				    int reg)
 {
 	struct i2c_adapter *i2c = bus->priv;
 	struct i2c_msg msgs[2];
@@ -41,8 +42,8 @@ static int i2c_mii_read_default(struct mii_bus *bus, int phy_id, int reg)
 		return 0xffff;
 
 	p = addr;
-	if (reg & MII_ADDR_C45) {
-		*p++ = 0x20 | ((reg >> 16) & 31);
+	if (devad >= 0) {
+		*p++ = 0x20 | devad;
 		*p++ = reg >> 8;
 	}
 	*p++ = reg;
@@ -64,8 +65,8 @@ static int i2c_mii_read_default(struct mii_bus *bus, int phy_id, int reg)
 	return data[0] << 8 | data[1];
 }
 
-static int i2c_mii_write_default(struct mii_bus *bus, int phy_id, int reg,
-				 u16 val)
+static int i2c_mii_write_default_c45(struct mii_bus *bus, int phy_id,
+				     int devad, int reg, u16 val)
 {
 	struct i2c_adapter *i2c = bus->priv;
 	struct i2c_msg msg;
@@ -76,8 +77,8 @@ static int i2c_mii_write_default(struct mii_bus *bus, int phy_id, int reg,
 		return 0;
 
 	p = data;
-	if (reg & MII_ADDR_C45) {
-		*p++ = (reg >> 16) & 31;
+	if (devad >= 0) {
+		*p++ = devad;
 		*p++ = reg >> 8;
 	}
 	*p++ = reg;
@@ -94,6 +95,17 @@ static int i2c_mii_write_default(struct mii_bus *bus, int phy_id, int reg,
 	return ret < 0 ? ret : 0;
 }
 
+static int i2c_mii_read_default_c22(struct mii_bus *bus, int phy_id, int reg)
+{
+	return i2c_mii_read_default_c45(bus, phy_id, -1, reg);
+}
+
+static int i2c_mii_write_default_c22(struct mii_bus *bus, int phy_id, int reg,
+				     u16 val)
+{
+	return i2c_mii_write_default_c45(bus, phy_id, -1, reg, val);
+}
+
 /* RollBall SFPs do not access internal PHY via I2C address 0x56, but
  * instead via address 0x51, when SFP page is set to 0x03 and password to
  * 0xffffffff.
@@ -403,8 +415,10 @@ struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c,
 		mii->write = i2c_mii_write_rollball;
 		break;
 	default:
-		mii->read = i2c_mii_read_default;
-		mii->write = i2c_mii_write_default;
+		mii->read = i2c_mii_read_default_c22;
+		mii->write = i2c_mii_write_default_c22;
+		mii->read_c45 = i2c_mii_read_default_c45;
+		mii->write_c45 = i2c_mii_write_default_c45;
 		break;
 	}
 
diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
index 4eba5a91075c..78b93de636f5 100644
--- a/drivers/net/mdio/mdio-ipq4019.c
+++ b/drivers/net/mdio/mdio-ipq4019.c
@@ -53,7 +53,8 @@ static int ipq4019_mdio_wait_busy(struct mii_bus *bus)
 				  IPQ4019_MDIO_SLEEP, IPQ4019_MDIO_TIMEOUT);
 }
 
-static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+static int ipq4019_mdio_read_c45(struct mii_bus *bus, int mii_id, int mmd,
+				 int reg)
 {
 	struct ipq4019_mdio_data *priv = bus->priv;
 	unsigned int data;
@@ -62,61 +63,71 @@ static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
 	if (ipq4019_mdio_wait_busy(bus))
 		return -ETIMEDOUT;
 
-	/* Clause 45 support */
-	if (regnum & MII_ADDR_C45) {
-		unsigned int mmd = (regnum >> 16) & 0x1F;
-		unsigned int reg = regnum & 0xFFFF;
+	data = readl(priv->membase + MDIO_MODE_REG);
 
-		/* Enter Clause 45 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	data |= MDIO_MODE_C45;
 
-		data |= MDIO_MODE_C45;
+	writel(data, priv->membase + MDIO_MODE_REG);
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	/* issue the phy address and mmd */
+	writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
 
-		/* issue the phy address and mmd */
-		writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+	/* issue reg */
+	writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
 
-		/* issue reg */
-		writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
 
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
-	} else {
-		/* Enter Clause 22 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	/* issue read command */
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		data &= ~MDIO_MODE_C45;
+	/* Wait read complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_READ;
 
-		/* issue the phy address and reg */
-		writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
-	}
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-	/* issue read command */
-	writel(cmd, priv->membase + MDIO_CMD_REG);
+	/* Read and return data */
+	return readl(priv->membase + MDIO_DATA_READ_REG);
+}
+
+static int ipq4019_mdio_read_c22(struct mii_bus *bus, int mii_id, int regnum)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	unsigned int data;
+	unsigned int cmd;
 
-	/* Wait read complete */
 	if (ipq4019_mdio_wait_busy(bus))
 		return -ETIMEDOUT;
 
-	if (regnum & MII_ADDR_C45) {
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_READ;
+	data = readl(priv->membase + MDIO_MODE_REG);
 
-		writel(cmd, priv->membase + MDIO_CMD_REG);
+	data &= ~MDIO_MODE_C45;
 
-		if (ipq4019_mdio_wait_busy(bus))
-			return -ETIMEDOUT;
-	}
+	writel(data, priv->membase + MDIO_MODE_REG);
+
+	/* issue the phy address and reg */
+	writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
+
+	/* issue read command */
+	writel(cmd, priv->membase + MDIO_CMD_REG);
+
+	/* Wait read complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
 	/* Read and return data */
 	return readl(priv->membase + MDIO_DATA_READ_REG);
 }
 
-static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
-							 u16 value)
+static int ipq4019_mdio_write_c45(struct mii_bus *bus, int mii_id, int mmd,
+				  int reg, u16 value)
 {
 	struct ipq4019_mdio_data *priv = bus->priv;
 	unsigned int data;
@@ -125,50 +136,63 @@ static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
 	if (ipq4019_mdio_wait_busy(bus))
 		return -ETIMEDOUT;
 
-	/* Clause 45 support */
-	if (regnum & MII_ADDR_C45) {
-		unsigned int mmd = (regnum >> 16) & 0x1F;
-		unsigned int reg = regnum & 0xFFFF;
+	data = readl(priv->membase + MDIO_MODE_REG);
 
-		/* Enter Clause 45 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	data |= MDIO_MODE_C45;
 
-		data |= MDIO_MODE_C45;
+	writel(data, priv->membase + MDIO_MODE_REG);
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	/* issue the phy address and mmd */
+	writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
 
-		/* issue the phy address and mmd */
-		writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+	/* issue reg */
+	writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
 
-		/* issue reg */
-		writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
 
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		writel(cmd, priv->membase + MDIO_CMD_REG);
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-		if (ipq4019_mdio_wait_busy(bus))
-			return -ETIMEDOUT;
-	} else {
-		/* Enter Clause 22 mode */
-		data = readl(priv->membase + MDIO_MODE_REG);
+	/* issue write data */
+	writel(value, priv->membase + MDIO_DATA_WRITE_REG);
 
-		data &= ~MDIO_MODE_C45;
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_WRITE;
+	writel(cmd, priv->membase + MDIO_CMD_REG);
 
-		writel(data, priv->membase + MDIO_MODE_REG);
+	/* Wait write complete */
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
 
-		/* issue the phy address and reg */
-		writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
-	}
+	return 0;
+}
+
+static int ipq4019_mdio_write_c22(struct mii_bus *bus, int mii_id, int regnum,
+				  u16 value)
+{
+	struct ipq4019_mdio_data *priv = bus->priv;
+	unsigned int data;
+	unsigned int cmd;
+
+	if (ipq4019_mdio_wait_busy(bus))
+		return -ETIMEDOUT;
+
+	/* Enter Clause 22 mode */
+	data = readl(priv->membase + MDIO_MODE_REG);
+
+	data &= ~MDIO_MODE_C45;
+
+	writel(data, priv->membase + MDIO_MODE_REG);
+
+	/* issue the phy address and reg */
+	writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
 
 	/* issue write data */
 	writel(value, priv->membase + MDIO_DATA_WRITE_REG);
 
 	/* issue write command */
-	if (regnum & MII_ADDR_C45)
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_WRITE;
-	else
-		cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
+	cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
 
 	writel(cmd, priv->membase + MDIO_CMD_REG);
 
@@ -235,8 +259,10 @@ static int ipq4019_mdio_probe(struct platform_device *pdev)
 		priv->eth_ldo_rdy = devm_ioremap_resource(&pdev->dev, res);
 
 	bus->name = "ipq4019_mdio";
-	bus->read = ipq4019_mdio_read;
-	bus->write = ipq4019_mdio_write;
+	bus->read = ipq4019_mdio_read_c22;
+	bus->write = ipq4019_mdio_write_c22;
+	bus->read_c45 = ipq4019_mdio_read_c45;
+	bus->write_c45 = ipq4019_mdio_write_c45;
 	bus->reset = ipq_mdio_reset;
 	bus->parent = &pdev->dev;
 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s%d", pdev->name, pdev->id);
diff --git a/drivers/net/mdio/mdio-mux-bcm-iproc.c b/drivers/net/mdio/mdio-mux-bcm-iproc.c
index 014c0baedbd2..956d54846b62 100644
--- a/drivers/net/mdio/mdio-mux-bcm-iproc.c
+++ b/drivers/net/mdio/mdio-mux-bcm-iproc.c
@@ -98,7 +98,7 @@ static int iproc_mdio_wait_for_idle(void __iomem *base, bool result)
  * Return value: Successful Read operation returns read reg values and write
  *      operation returns 0. Failure operation returns negative error code.
  */
-static int start_miim_ops(void __iomem *base,
+static int start_miim_ops(void __iomem *base, bool c45,
 			  u16 phyid, u32 reg, u16 val, u32 op)
 {
 	u32 param;
@@ -112,7 +112,7 @@ static int start_miim_ops(void __iomem *base,
 	param = readl(base + MDIO_PARAM_OFFSET);
 	param |= phyid << MDIO_PARAM_PHY_ID;
 	param |= val << MDIO_PARAM_PHY_DATA;
-	if (reg & MII_ADDR_C45)
+	if (c45)
 		param |= BIT(MDIO_PARAM_C45_SEL);
 
 	writel(param, base + MDIO_PARAM_OFFSET);
@@ -131,28 +131,58 @@ err:
 	return ret;
 }
 
-static int iproc_mdiomux_read(struct mii_bus *bus, int phyid, int reg)
+static int iproc_mdiomux_read_c22(struct mii_bus *bus, int phyid, int reg)
 {
 	struct iproc_mdiomux_desc *md = bus->priv;
 	int ret;
 
-	ret = start_miim_ops(md->base, phyid, reg, 0, MDIO_CTRL_READ_OP);
+	ret = start_miim_ops(md->base, false, phyid, reg, 0, MDIO_CTRL_READ_OP);
 	if (ret < 0)
-		dev_err(&bus->dev, "mdiomux read operation failed!!!");
+		dev_err(&bus->dev, "mdiomux c22 read operation failed!!!");
 
 	return ret;
 }
 
-static int iproc_mdiomux_write(struct mii_bus *bus,
-			       int phyid, int reg, u16 val)
+static int iproc_mdiomux_read_c45(struct mii_bus *bus, int phyid, int devad,
+				  int reg)
+{
+	struct iproc_mdiomux_desc *md = bus->priv;
+	int ret;
+
+	ret = start_miim_ops(md->base, true, phyid, reg | devad << 16, 0,
+			     MDIO_CTRL_READ_OP);
+	if (ret < 0)
+		dev_err(&bus->dev, "mdiomux read c45 operation failed!!!");
+
+	return ret;
+}
+
+static int iproc_mdiomux_write_c22(struct mii_bus *bus,
+				   int phyid, int reg, u16 val)
+{
+	struct iproc_mdiomux_desc *md = bus->priv;
+	int ret;
+
+	/* Write val at reg offset */
+	ret = start_miim_ops(md->base, false, phyid, reg, val,
+			     MDIO_CTRL_WRITE_OP);
+	if (ret < 0)
+		dev_err(&bus->dev, "mdiomux write c22 operation failed!!!");
+
+	return ret;
+}
+
+static int iproc_mdiomux_write_c45(struct mii_bus *bus,
+				   int phyid, int devad, int reg, u16 val)
 {
 	struct iproc_mdiomux_desc *md = bus->priv;
 	int ret;
 
 	/* Write val at reg offset */
-	ret = start_miim_ops(md->base, phyid, reg, val, MDIO_CTRL_WRITE_OP);
+	ret = start_miim_ops(md->base, true, phyid, reg | devad << 16, val,
+			     MDIO_CTRL_WRITE_OP);
 	if (ret < 0)
-		dev_err(&bus->dev, "mdiomux write operation failed!!!");
+		dev_err(&bus->dev, "mdiomux write c45 operation failed!!!");
 
 	return ret;
 }
@@ -223,8 +253,10 @@ static int mdio_mux_iproc_probe(struct platform_device *pdev)
 	bus->name = "iProc MDIO mux bus";
 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);
 	bus->parent = &pdev->dev;
-	bus->read = iproc_mdiomux_read;
-	bus->write = iproc_mdiomux_write;
+	bus->read = iproc_mdiomux_read_c22;
+	bus->write = iproc_mdiomux_write_c22;
+	bus->read_c45 = iproc_mdiomux_read_c45;
+	bus->write_c45 = iproc_mdiomux_write_c45;
 
 	bus->phy_mask = ~0;
 	bus->dev.of_node = pdev->dev.of_node;
diff --git a/drivers/net/mdio/mdio-octeon.c b/drivers/net/mdio/mdio-octeon.c
index e096e68ac667..7c65c547d377 100644
--- a/drivers/net/mdio/mdio-octeon.c
+++ b/drivers/net/mdio/mdio-octeon.c
@@ -58,8 +58,10 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
 	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
 	bus->mii_bus->parent = &pdev->dev;
 
-	bus->mii_bus->read = cavium_mdiobus_read;
-	bus->mii_bus->write = cavium_mdiobus_write;
+	bus->mii_bus->read = cavium_mdiobus_read_c22;
+	bus->mii_bus->write = cavium_mdiobus_write_c22;
+	bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
+	bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
 
 	platform_set_drvdata(pdev, bus);
 
diff --git a/drivers/net/mdio/mdio-thunder.c b/drivers/net/mdio/mdio-thunder.c
index 822d2cdd2f35..3847ee92c109 100644
--- a/drivers/net/mdio/mdio-thunder.c
+++ b/drivers/net/mdio/mdio-thunder.c
@@ -93,8 +93,10 @@ static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
 		bus->mii_bus->name = KBUILD_MODNAME;
 		snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", r.start);
 		bus->mii_bus->parent = &pdev->dev;
-		bus->mii_bus->read = cavium_mdiobus_read;
-		bus->mii_bus->write = cavium_mdiobus_write;
+		bus->mii_bus->read = cavium_mdiobus_read_c22;
+		bus->mii_bus->write = cavium_mdiobus_write_c22;
+		bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
+		bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
 
 		err = of_mdiobus_register(bus->mii_bus, node);
 		if (err)
diff --git a/include/linux/fsl/enetc_mdio.h b/include/linux/fsl/enetc_mdio.h
index 2d9203314865..df25fffdc0ae 100644
--- a/include/linux/fsl/enetc_mdio.h
+++ b/include/linux/fsl/enetc_mdio.h
@@ -37,16 +37,27 @@ struct enetc_mdio_priv {
 
 #if IS_REACHABLE(CONFIG_FSL_ENETC_MDIO)
 
-int enetc_mdio_read(struct mii_bus *bus, int phy_id, int regnum);
-int enetc_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 value);
+int enetc_mdio_read_c22(struct mii_bus *bus, int phy_id, int regnum);
+int enetc_mdio_write_c22(struct mii_bus *bus, int phy_id, int regnum,
+			 u16 value);
+int enetc_mdio_read_c45(struct mii_bus *bus, int phy_id, int devad, int regnum);
+int enetc_mdio_write_c45(struct mii_bus *bus, int phy_id, int devad, int regnum,
+			 u16 value);
 struct enetc_hw *enetc_hw_alloc(struct device *dev, void __iomem *port_regs);
 
 #else
 
-static inline int enetc_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
+static inline int enetc_mdio_read_c22(struct mii_bus *bus, int phy_id,
+				      int regnum)
 { return -EINVAL; }
-static inline int enetc_mdio_write(struct mii_bus *bus, int phy_id, int regnum,
-				   u16 value)
+static inline int enetc_mdio_write_c22(struct mii_bus *bus, int phy_id,
+				       int regnum, u16 value)
+{ return -EINVAL; }
+static inline int enetc_mdio_read_c45(struct mii_bus *bus, int phy_id,
+				      int devad, int regnum)
+{ return -EINVAL; }
+static inline int enetc_mdio_write_c45(struct mii_bus *bus, int phy_id,
+				       int devad, int regnum, u16 value)
 { return -EINVAL; }
 struct enetc_hw *enetc_hw_alloc(struct device *dev, void __iomem *port_regs)
 { return ERR_PTR(-EINVAL); }