Merge branch 'net-add-phylink-support-for-PCS'

Russell King says:

====================
net: add phylink support for PCS

This series adds support for IEEE 802.3 register set compliant PCS
for phylink.  In order to do this, we:

1. convert BUG_ON() in existing accessors to WARN_ON_ONCE() and return
   an error.
2. add accessors for modifying a MDIO device register, and use them in
   phylib, rather than duplicating the code from phylib.
3. add support for decoding the advertisement from clause 22 compatible
   register sets for clause 37 advertisements and SGMII advertisements.
4. add support for clause 45 register sets for 10GBASE-R PCS.

These have been tested on the LX2160A Clearfog-CX platform.

v2: eliminate use of BUG_ON() in the accessors.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 31 insertions, 0 deletions

diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index a7604248777b..917e4bb2ed71 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -316,11 +316,15 @@ static inline void mii_10gbt_stat_mod_linkmode_lpa_t(unsigned long *advertising,
 
 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
+int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
+			     u16 mask, u16 set);
 
 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
+int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
+		   u16 set);
 
 int mdiobus_register_device(struct mdio_device *mdiodev);
 int mdiobus_unregister_device(struct mdio_device *mdiodev);
diff --git a/include/linux/phy.h b/include/linux/phy.h
index cb5a2182ba6d..36d9dea04016 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -755,6 +755,25 @@ static inline int __phy_write(struct phy_device *phydev, u32 regnum, u16 val)
 }
 
 /**
+ * __phy_modify_changed() - Convenience function for modifying a PHY register
+ * @phydev: a pointer to a &struct phy_device
+ * @regnum: register number
+ * @mask: bit mask of bits to clear
+ * @set: bit mask of bits to set
+ *
+ * Unlocked helper function which allows a PHY register to be modified as
+ * new register value = (old register value & ~mask) | set
+ *
+ * Returns negative errno, 0 if there was no change, and 1 in case of change
+ */
+static inline int __phy_modify_changed(struct phy_device *phydev, u32 regnum,
+				       u16 mask, u16 set)
+{
+	return __mdiobus_modify_changed(phydev->mdio.bus, phydev->mdio.addr,
+					regnum, mask, set);
+}
+
+/**
  * phy_read_mmd - Convenience function for reading a register
  * from an MMD on a given PHY.
  * @phydev: The phy_device struct
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 2180eb1aa254..8fa6df3b881b 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -317,4 +317,12 @@ int phylink_mii_ioctl(struct phylink *, struct ifreq *, int);
 void phylink_set_port_modes(unsigned long *bits);
 void phylink_helper_basex_speed(struct phylink_link_state *state);
 
+void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
+				   struct phylink_link_state *state);
+int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
+					const struct phylink_link_state *state);
+void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs);
+
+void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
+				   struct phylink_link_state *state);
 #endif