net: of_mdio: parse "max-speed" property to set PHY supported features
The "max-speed" property is defined per the ePAPR specification to
express the maximum speed a PHY supports. Use that property, if present
to set the phydev->supported features which properly restricts the PHY
within the range of defined speeds.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 14feffc..a43b852 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -22,12 +22,30 @@
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");
+static void of_set_phy_supported(struct phy_device *phydev, u32 max_speed)
+{
+ phydev->supported |= PHY_DEFAULT_FEATURES;
+
+ switch (max_speed) {
+ default:
+ return;
+
+ case SPEED_1000:
+ phydev->supported |= PHY_1000BT_FEATURES;
+ case SPEED_100:
+ phydev->supported |= PHY_100BT_FEATURES;
+ case SPEED_10:
+ phydev->supported |= PHY_10BT_FEATURES;
+ }
+}
+
static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *child,
u32 addr)
{
struct phy_device *phy;
bool is_c45;
int rc, prev_irq;
+ u32 max_speed = 0;
is_c45 = of_device_is_compatible(child,
"ethernet-phy-ieee802.3-c45");
@@ -58,8 +76,13 @@
return 1;
}
+ /* Set phydev->supported based on the "max-speed" property
+ * if present */
+ if (!of_property_read_u32(child, "max-speed", &max_speed))
+ of_set_phy_supported(phy, max_speed);
+
dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
- child->name, addr);
+ child->name, addr);
return 0;
}
