include/linux/of_mdio.h

   1 /*
   2  * OF helpers for the MDIO (Ethernet PHY) API
   3  *
   4  * Copyright (c) 2009 Secret Lab Technologies, Ltd.
   5  *
   6  * This file is released under the GPLv2
   7  */
   8
   9 #ifndef __LINUX_OF_MDIO_H
  10 #define __LINUX_OF_MDIO_H
  11
  12 #include <linux/phy.h>
  13 #include <linux/of.h>
  14
  15 #if IS_ENABLED(CONFIG_OF_MDIO)
  16 extern int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np);
  17 extern struct phy_device *of_phy_find_device(struct device_node *phy_np);
  18 extern struct phy_device *of_phy_connect(struct net_device *dev,
  19                                          struct device_node *phy_np,
  20                                          void (*hndlr)(struct net_device *),
  21                                          u32 flags, phy_interface_t iface);
  22 extern struct phy_device *
  23 of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
  24                        void (*hndlr)(struct net_device *));
  25 struct phy_device *of_phy_attach(struct net_device *dev,
  26                                  struct device_node *phy_np, u32 flags,
  27                                  phy_interface_t iface);
  28
  29 extern struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
  30 extern int of_phy_register_fixed_link(struct device_node *np);
  31 extern void of_phy_deregister_fixed_link(struct device_node *np);
  32 extern bool of_phy_is_fixed_link(struct device_node *np);
  33
  34
  35 static inline int of_mdio_parse_addr(struct device *dev,
  36                                      const struct device_node *np)
  37 {
  38         u32 addr;
  39         int ret;
  40
  41         ret = of_property_read_u32(np, "reg", &addr);
  42         if (ret < 0) {
  43                 dev_err(dev, "%s has invalid PHY address\n", np->full_name);
  44                 return ret;
  45         }
  46
  47         /* A PHY must have a reg property in the range [0-31] */
  48         if (addr >= PHY_MAX_ADDR) {
  49                 dev_err(dev, "%s PHY address %i is too large\n",
  50                         np->full_name, addr);
  51                 return -EINVAL;
  52         }
  53
  54         return addr;
  55 }
  56
  57 #else /* CONFIG_OF_MDIO */
  58 static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
  59 {
  60         /*
  61          * Fall back to the non-DT function to register a bus.
  62          * This way, we don't have to keep compat bits around in drivers.
  63          */
  64
  65         return mdiobus_register(mdio);
  66 }
  67
  68 static inline struct phy_device *of_phy_find_device(struct device_node *phy_np)
  69 {
  70         return NULL;
  71 }
  72
  73 static inline struct phy_device *of_phy_connect(struct net_device *dev,
  74                                                 struct device_node *phy_np,
  75                                                 void (*hndlr)(struct net_device *),
  76                                                 u32 flags, phy_interface_t iface)
  77 {
  78         return NULL;
  79 }
  80
  81 static inline struct phy_device *
  82 of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
  83                        void (*hndlr)(struct net_device *))
  84 {
  85         return NULL;
  86 }
  87
  88 static inline struct phy_device *of_phy_attach(struct net_device *dev,
  89                                                struct device_node *phy_np,
  90                                                u32 flags, phy_interface_t iface)
  91 {
  92         return NULL;
  93 }
  94
  95 static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
  96 {
  97         return NULL;
  98 }
  99
 100 static inline int of_mdio_parse_addr(struct device *dev,
 101                                      const struct device_node *np)
 102 {
 103         return -ENOSYS;
 104 }
 105 static inline int of_phy_register_fixed_link(struct device_node *np)
 106 {
 107         return -ENOSYS;
 108 }
 109 static inline void of_phy_deregister_fixed_link(struct device_node *np)
 110 {
 111 }
 112 static inline bool of_phy_is_fixed_link(struct device_node *np)
 113 {
 114         return false;
 115 }
 116 #endif
 117
 118
 119 #endif /* __LINUX_OF_MDIO_H */