Sanitize and advertise auto-negotiation parameters
int genphy_config_advert(struct phy_device * phydev);
phydev
target phy_device struct
Writes MII_ADVERTISE with the appropriate values, after sanitizing the values to make sure we only advertise what is supported. Returns < 0 on error, 0 if the PHY's advertisement hasn't changed, and > 0 if it has changed.