net: phy: marvell10g: add SFP+ support

Add support for SFP+ cages to the Marvell 10G PHY driver. This is
slightly complicated by the way phylib works in that we need to use
a multi-step process to attach the SFP bus, and we also need to track
the phylink state machine to know when the module's transmit disable
signal should change state.

With appropriate DT changes, this allows the SFP+ canges on the
Macchiatobin platform to be functional.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/marvell10g.c

@@ -26,6 +26,7 @@
 #include <linux/hwmon.h>
 #include <linux/marvell_phy.h>
 #include <linux/phy.h>
+#include <linux/sfp.h>
 
 #define MV_PHY_ALASKA_NBT_QUIRK_MASK	0xfffffffe
 #define MV_PHY_ALASKA_NBT_QUIRK_REV	(MARVELL_PHY_ID_88X3310 | 0xa)
@@ -206,6 +207,28 @@ static int mv3310_hwmon_probe(struct phy_device *phydev)
 }
 #endif
 
+static int mv3310_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
+{
+	struct phy_device *phydev = upstream;
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
+	phy_interface_t iface;
+
+	sfp_parse_support(phydev->sfp_bus, id, support);
+	iface = sfp_select_interface(phydev->sfp_bus, id, support);
+
+	if (iface != PHY_INTERFACE_MODE_10GKR) {
+		dev_err(&phydev->mdio.dev, "incompatible SFP module inserted\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const struct sfp_upstream_ops mv3310_sfp_ops = {
+	.attach = phy_sfp_attach,
+	.detach = phy_sfp_detach,
+	.module_insert = mv3310_sfp_insert,
+};
+
 static int mv3310_probe(struct phy_device *phydev)
 {
 	struct mv3310_priv *priv;
@@ -236,7 +259,7 @@ static int mv3310_probe(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
-	return 0;
+	return phy_sfp_probe(phydev, &mv3310_sfp_ops);
 }
 
 static int mv3310_suspend(struct phy_device *phydev)