/*
   * OF helpers for the MDIO (Ethernet PHY) API
   *
   * Copyright (c) 2009 Secret Lab Technologies, Ltd.
   *
   * This file is released under the GPLv2
   */
  
  #ifndef __LINUX_OF_MDIO_H
  #define __LINUX_OF_MDIO_H
  
  #include <linux/phy.h>
  #include <linux/of.h>

  #if IS_ENABLED(CONFIG_OF_MDIO)

  extern int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np);
  extern struct phy_device *of_phy_find_device(struct device_node *phy_np);
  extern struct phy_device *of_phy_connect(struct net_device *dev,
  					 struct device_node *phy_np,
  					 void (*hndlr)(struct net_device *),
  					 u32 flags, phy_interface_t iface);

  extern struct phy_device *
  of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
  		       void (*hndlr)(struct net_device *));

  struct phy_device *of_phy_attach(struct net_device *dev,
  				 struct device_node *phy_np, u32 flags,
  				 phy_interface_t iface);

  extern struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);

  extern int of_phy_register_fixed_link(struct device_node *np);

  extern void of_phy_deregister_fixed_link(struct device_node *np);

  extern bool of_phy_is_fixed_link(struct device_node *np);

  
  static inline int of_mdio_parse_addr(struct device *dev,
  				     const struct device_node *np)
  {
  	u32 addr;
  	int ret;
  
  	ret = of_property_read_u32(np, "reg", &addr);
  	if (ret < 0) {
  		dev_err(dev, "%s has invalid PHY address
  ", np->full_name);
  		return ret;
  	}
  
  	/* A PHY must have a reg property in the range [0-31] */
  	if (addr >= PHY_MAX_ADDR) {
  		dev_err(dev, "%s PHY address %i is too large
  ",
  			np->full_name, addr);
  		return -EINVAL;
  	}
  
  	return addr;
  }

  #else /* CONFIG_OF_MDIO */

  static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)

  {

  	/*
  	 * Fall back to the non-DT function to register a bus.
  	 * This way, we don't have to keep compat bits around in drivers.
  	 */
  
  	return mdiobus_register(mdio);

  }

  static inline struct phy_device *of_phy_find_device(struct device_node *phy_np)

  {
  	return NULL;
  }

  static inline struct phy_device *of_phy_connect(struct net_device *dev,
  						struct device_node *phy_np,
  						void (*hndlr)(struct net_device *),
  						u32 flags, phy_interface_t iface)

  {
  	return NULL;
  }

  static inline struct phy_device *
  of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
  		       void (*hndlr)(struct net_device *))
  {
  	return NULL;
  }

  static inline struct phy_device *of_phy_attach(struct net_device *dev,
  					       struct device_node *phy_np,
  					       u32 flags, phy_interface_t iface)
  {
  	return NULL;
  }

  static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)

  {
  	return NULL;
  }

  
  static inline int of_mdio_parse_addr(struct device *dev,
  				     const struct device_node *np)
  {
  	return -ENOSYS;
  }

  static inline int of_phy_register_fixed_link(struct device_node *np)
  {
  	return -ENOSYS;
  }

  static inline void of_phy_deregister_fixed_link(struct device_node *np)
  {
  }

  static inline bool of_phy_is_fixed_link(struct device_node *np)
  {
  	return false;
  }
  #endif

  #endif /* __LINUX_OF_MDIO_H */