net: phy: export phy_{read,write}_mmd_indirect

Some PHY drivers might need to access Clause 45 registers in Clause 22
compatibility mode to e.g: properly advertise EEE support when disabled
by default.

Export these two helper functions: phy_read_mmd_indirect() and
phy_write_mmd_indirect() for drivers to use them.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/phy.h

@@ -597,6 +597,19 @@ static inline int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
 			    MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff));
 }
 
+/**
+ * phy_read_mmd_indirect - reads data from the MMD registers
+ * @phydev: The PHY device bus
+ * @prtad: MMD Address
+ * @devad: MMD DEVAD
+ * @addr: PHY address on the MII bus
+ *
+ * Description: it reads data from the MMD registers (clause 22 to access to
+ * clause 45) of the specified phy address.
+ */
+int phy_read_mmd_indirect(struct phy_device *phydev, int prtad,
+			  int devad, int addr);
+
 /**
  * phy_read - Convenience function for reading a given PHY register
  * @phydev: the phy_device struct
@@ -668,6 +681,20 @@ static inline int phy_write_mmd(struct phy_device *phydev, int devad,
 	return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
 }
 
+/**
+ * phy_write_mmd_indirect - writes data to the MMD registers
+ * @phydev: The PHY device
+ * @prtad: MMD Address
+ * @devad: MMD DEVAD
+ * @addr: PHY address on the MII bus
+ * @data: data to write in the MMD register
+ *
+ * Description: Write data from the MMD registers of the specified
+ * phy address.
+ */
+void phy_write_mmd_indirect(struct phy_device *phydev, int prtad,
+			    int devad, int addr, u32 data);
+
 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids);