net: phylib: add link_change_notify callback to phy device

Add a notify callback to inform phy drivers when the core is about to
do its link adjustment. No change for drivers that do not implement
this callback.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 864ddafad8cc..68041446c450 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -536,6 +536,15 @@ struct phy_driver {
         /* See set_wol, but for checking whether Wake on LAN is enabled. */
         void (*get_wol)(struct phy_device *dev, struct ethtool_wolinfo *wol);
 
+        /*
+         * Called to inform a PHY device driver when the core is about to
+         * change the link state. This callback is supposed to be used as
+         * fixup hook for drivers that need to take action when the link
+         * state changes. Drivers are by no means allowed to mess with the
+         * PHY device structure in their implementations.
+         */
+        void (*link_change_notify)(struct phy_device *dev);
+
         struct device_driver driver;
 };
 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)