diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 71a499113308..ed17163d7811 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -3044,23 +3044,46 @@ static int sh_mdio_release(struct sh_eth_private *mdp)
 	return 0;
 }
 
-static int sh_mdiobb_read(struct mii_bus *bus, int phy, int reg)
+static int sh_mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
 {
 	int res;
 
 	pm_runtime_get_sync(bus->parent);
-	res = mdiobb_read(bus, phy, reg);
+	res = mdiobb_read_c22(bus, phy, reg);
 	pm_runtime_put(bus->parent);
 
 	return res;
 }
 
-static int sh_mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
+static int sh_mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val)
 {
 	int res;
 
 	pm_runtime_get_sync(bus->parent);
-	res = mdiobb_write(bus, phy, reg, val);
+	res = mdiobb_write_c22(bus, phy, reg, val);
+	pm_runtime_put(bus->parent);
+
+	return res;
+}
+
+static int sh_mdiobb_read_c45(struct mii_bus *bus, int phy, int devad, int reg)
+{
+	int res;
+
+	pm_runtime_get_sync(bus->parent);
+	res = mdiobb_read_c45(bus, phy, devad, reg);
+	pm_runtime_put(bus->parent);
+
+	return res;
+}
+
+static int sh_mdiobb_write_c45(struct mii_bus *bus, int phy, int devad,
+			       int reg, u16 val)
+{
+	int res;
+
+	pm_runtime_get_sync(bus->parent);
+	res = mdiobb_write_c45(bus, phy, devad, reg, val);
 	pm_runtime_put(bus->parent);
 
 	return res;
@@ -3091,8 +3114,10 @@ static int sh_mdio_init(struct sh_eth_private *mdp,
 		return -ENOMEM;
 
 	/* Wrap accessors with Runtime PM-aware ops */
-	mdp->mii_bus->read = sh_mdiobb_read;
-	mdp->mii_bus->write = sh_mdiobb_write;
+	mdp->mii_bus->read = sh_mdiobb_read_c22;
+	mdp->mii_bus->write = sh_mdiobb_write_c22;
+	mdp->mii_bus->read_c45 = sh_mdiobb_read_c45;
+	mdp->mii_bus->write_c45 = sh_mdiobb_write_c45;
 
 	/* Hook up MII support for ethtool */
 	mdp->mii_bus->name = "sh_mii";
diff --git a/drivers/net/mdio/mdio-bitbang.c b/drivers/net/mdio/mdio-bitbang.c
index 07609114a26b..b83932562be2 100644
--- a/drivers/net/mdio/mdio-bitbang.c
+++ b/drivers/net/mdio/mdio-bitbang.c
@@ -127,14 +127,12 @@ static void mdiobb_cmd(struct mdiobb_ctrl *ctrl, int op, u8 phy, u8 reg)
 
 /* In clause 45 mode all commands are prefixed by MDIO_ADDR to specify the
    lower 16 bits of the 21 bit address. This transfer is done identically to a
-   MDIO_WRITE except for a different code. To enable clause 45 mode or
-   MII_ADDR_C45 into the address. Theoretically clause 45 and normal devices
-   can exist on the same bus. Normal devices should ignore the MDIO_ADDR
+   MDIO_WRITE except for a different code. Theoretically clause 45 and normal
+   devices can exist on the same bus. Normal devices should ignore the MDIO_ADDR
    phase. */
-static int mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, u32 addr)
+static void mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, int dev_addr,
+			    int reg)
 {
-	unsigned int dev_addr = (addr >> 16) & 0x1F;
-	unsigned int reg = addr & 0xFFFF;
 	mdiobb_cmd(ctrl, MDIO_C45_ADDR, phy, dev_addr);
 
 	/* send the turnaround (10) */
@@ -145,21 +143,13 @@ static int mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, u32 addr)
 
 	ctrl->ops->set_mdio_dir(ctrl, 0);
 	mdiobb_get_bit(ctrl);
-
-	return dev_addr;
 }
 
-int mdiobb_read(struct mii_bus *bus, int phy, int reg)
+static int mdiobb_read_common(struct mii_bus *bus, int phy)
 {
 	struct mdiobb_ctrl *ctrl = bus->priv;
 	int ret, i;
 
-	if (reg & MII_ADDR_C45) {
-		reg = mdiobb_cmd_addr(ctrl, phy, reg);
-		mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg);
-	} else
-		mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg);
-
 	ctrl->ops->set_mdio_dir(ctrl, 0);
 
 	/* check the turnaround bit: the PHY should be driving it to zero, if this
@@ -180,17 +170,31 @@ int mdiobb_read(struct mii_bus *bus, int phy, int reg)
 	mdiobb_get_bit(ctrl);
 	return ret;
 }
-EXPORT_SYMBOL(mdiobb_read);
 
-int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
+int mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
 {
 	struct mdiobb_ctrl *ctrl = bus->priv;
 
-	if (reg & MII_ADDR_C45) {
-		reg = mdiobb_cmd_addr(ctrl, phy, reg);
-		mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg);
-	} else
-		mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg);
+	mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg);
+
+	return mdiobb_read_common(bus, phy);
+}
+EXPORT_SYMBOL(mdiobb_read_c22);
+
+int mdiobb_read_c45(struct mii_bus *bus, int phy, int devad, int reg)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
+
+	mdiobb_cmd_addr(ctrl, phy, devad, reg);
+	mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg);
+
+	return mdiobb_read_common(bus, phy);
+}
+EXPORT_SYMBOL(mdiobb_read_c45);
+
+static int mdiobb_write_common(struct mii_bus *bus, u16 val)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
 
 	/* send the turnaround (10) */
 	mdiobb_send_bit(ctrl, 1);
@@ -202,7 +206,27 @@ int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
 	mdiobb_get_bit(ctrl);
 	return 0;
 }
-EXPORT_SYMBOL(mdiobb_write);
+
+int mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
+
+	mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg);
+
+	return mdiobb_write_common(bus, val);
+}
+EXPORT_SYMBOL(mdiobb_write_c22);
+
+int mdiobb_write_c45(struct mii_bus *bus, int phy, int devad, int reg, u16 val)
+{
+	struct mdiobb_ctrl *ctrl = bus->priv;
+
+	mdiobb_cmd_addr(ctrl, phy, devad, reg);
+	mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg);
+
+	return mdiobb_write_common(bus, val);
+}
+EXPORT_SYMBOL(mdiobb_write_c45);
 
 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl)
 {
@@ -214,8 +238,11 @@ struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl)
 
 	__module_get(ctrl->ops->owner);
 
-	bus->read = mdiobb_read;
-	bus->write = mdiobb_write;
+	bus->read = mdiobb_read_c22;
+	bus->write = mdiobb_write_c22;
+	bus->read_c45 = mdiobb_read_c45;
+	bus->write_c45 = mdiobb_write_c45;
+
 	bus->priv = ctrl;
 	if (!ctrl->override_op_c22) {
 		ctrl->op_c22_read = MDIO_READ;
diff --git a/include/linux/mdio-bitbang.h b/include/linux/mdio-bitbang.h
index 373630fe5c28..cffabdbce075 100644
--- a/include/linux/mdio-bitbang.h
+++ b/include/linux/mdio-bitbang.h
@@ -38,8 +38,10 @@ struct mdiobb_ctrl {
 	u8 op_c22_write;
 };
 
-int mdiobb_read(struct mii_bus *bus, int phy, int reg);
-int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val);
+int mdiobb_read_c22(struct mii_bus *bus, int phy, int reg);
+int mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val);
+int mdiobb_read_c45(struct mii_bus *bus, int devad, int phy, int reg);
+int mdiobb_write_c45(struct mii_bus *bus, int devad, int phy, int reg, u16 val);
 
 /* The returned bus is not yet registered with the phy layer. */
 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
