[net-next RFC PATCH 10/14] net: phy: add support for PHY package MMD read/write

[Christian Marangi <ansuelsmth@gmail.com>]

Some PHY in PHY package may require to read/write MMD regs to correctly
configure the PHY package.

Add support for these additional required function in both lock and no
lock variant.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 include/linux/phy.h | 72 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index dd2381652dd1..90bfaa36689f 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -2110,6 +2110,78 @@ static inline int __phy_package_write(struct phy_device *phydev,
 	return __mdiobus_write(phydev->mdio.bus, addr, regnum, val);
 }
 
+static inline int phy_package_read_mmd(struct phy_device *phydev,
+				       int global_phy_index, int devad, u32 regnum)
+{
+	struct phy_package_shared *shared = phydev->shared;
+	struct mii_bus *bus = phydev->mdio.bus;
+	int addr, val;
+
+	if (!shared || global_phy_index > shared->addrs_num - 1)
+		return -EIO;
+
+	addr = shared->addrs[global_phy_index];
+
+	phy_lock_mdio_bus(phydev);
+	mmd_phy_indirect(bus, addr, devad, regnum);
+	val = __mdiobus_read(bus, addr, MII_MMD_DATA);
+	phy_unlock_mdio_bus(phydev);
+
+	return val;
+}
+
+static inline int __phy_package_read_mmd(struct phy_device *phydev,
+					 int global_phy_index, int devad, u32 regnum)
+{
+	struct phy_package_shared *shared = phydev->shared;
+	struct mii_bus *bus = phydev->mdio.bus;
+	int addr;
+
+	if (!shared || global_phy_index > shared->addrs_num - 1)
+		return -EIO;
+
+	addr = shared->addrs[global_phy_index];
+	mmd_phy_indirect(bus, addr, devad, regnum);
+	return __mdiobus_read(bus, addr, MII_MMD_DATA);
+}
+
+static inline int phy_package_write_mmd(struct phy_device *phydev,
+					int global_phy_index, int devad,
+					u32 regnum, u16 val)
+{
+	struct phy_package_shared *shared = phydev->shared;
+	struct mii_bus *bus = phydev->mdio.bus;
+	int addr, ret;
+
+	if (!shared || global_phy_index > shared->addrs_num - 1)
+		return -EIO;
+
+	addr = shared->addrs[global_phy_index];
+
+	phy_lock_mdio_bus(phydev);
+	mmd_phy_indirect(bus, addr, devad, regnum);
+	ret = __mdiobus_write(bus, addr, MII_MMD_DATA, val);
+	phy_unlock_mdio_bus(phydev);
+
+	return ret;
+}
+
+static inline int __phy_package_write_mmd(struct phy_device *phydev,
+					  int global_phy_index, int devad,
+					  u32 regnum, u16 val)
+{
+	struct phy_package_shared *shared = phydev->shared;
+	struct mii_bus *bus = phydev->mdio.bus;
+	int addr;
+
+	if (!shared || global_phy_index > shared->addrs_num - 1)
+		return -EIO;
+
+	addr = shared->addrs[global_phy_index];
+	mmd_phy_indirect(bus, addr, devad, regnum);
+	return __mdiobus_write(bus, addr, MII_MMD_DATA, val);
+}
+
 static inline bool __phy_package_set_once(struct phy_device *phydev,
 					  unsigned int b)
 {
-- 
2.40.1