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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-05-16 18:14:05 +0400
committerDavid S. Miller <davem@davemloft.net>2014-05-17 01:19:22 +0400
commit3be2a49e5c08d268f8af0dd4fe89a24ea8cdc339 (patch)
tree83d32019dd08257b68821bafa59bbcd4e089ce76 /include/linux/of_mdio.h
parenta75951217472c522c324adb0a4de3ba69d656ef5 (diff)
downloadlinux-3be2a49e5c08d268f8af0dd4fe89a24ea8cdc339.tar.xz
of: provide a binding for fixed link PHYs
Some Ethernet MACs have a "fixed link", and are not connected to a normal MDIO-managed PHY device. For those situations, a Device Tree binding allows to describe a "fixed link" using a special PHY node. This patch adds: * A documentation for the fixed PHY Device Tree binding. * An of_phy_is_fixed_link() function that an Ethernet driver can call on its PHY phandle to find out whether it's a fixed link PHY or not. It should typically be used to know if of_phy_register_fixed_link() should be called. * An of_phy_register_fixed_link() function that instantiates the fixed PHY into the PHY subsystem, so that when the driver calls of_phy_connect(), the PHY device associated to the OF node will be found. These two additional functions also support the old fixed-link Device Tree binding used on PowerPC platforms, so that ultimately, the network device drivers for those platforms could be converted to use of_phy_is_fixed_link() and of_phy_register_fixed_link() instead of of_phy_connect_fixed_link(), while keeping compatibility with their respective Device Tree bindings. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Tested-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/of_mdio.h')
-rw-r--r--include/linux/of_mdio.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
index 881a7c3571f4..0aa367e316cb 100644
--- a/include/linux/of_mdio.h
+++ b/include/linux/of_mdio.h
@@ -72,4 +72,19 @@ static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
}
#endif /* CONFIG_OF */
+#if defined(CONFIG_OF) && defined(CONFIG_FIXED_PHY)
+extern int of_phy_register_fixed_link(struct device_node *np);
+extern bool of_phy_is_fixed_link(struct device_node *np);
+#else
+static inline int of_phy_register_fixed_link(struct device_node *np)
+{
+ return -ENOSYS;
+}
+static inline bool of_phy_is_fixed_link(struct device_node *np)
+{
+ return false;
+}
+#endif
+
+
#endif /* __LINUX_OF_MDIO_H */