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Linux/include/linux/of_mdio.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * OF helpers for the MDIO (Ethernet PHY) API
  4  *
  5  * Copyright (c) 2009 Secret Lab Technologies, Ltd.
  6  */
  7 
  8 #ifndef __LINUX_OF_MDIO_H
  9 #define __LINUX_OF_MDIO_H
 10 
 11 #include <linux/device.h>
 12 #include <linux/phy.h>
 13 #include <linux/of.h>
 14 
 15 #if IS_ENABLED(CONFIG_OF_MDIO)
 16 bool of_mdiobus_child_is_phy(struct device_node *child);
 17 int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np);
 18 int devm_of_mdiobus_register(struct device *dev, struct mii_bus *mdio,
 19                              struct device_node *np);
 20 struct phy_device *of_phy_find_device(struct device_node *phy_np);
 21 struct phy_device *
 22 of_phy_connect(struct net_device *dev, struct device_node *phy_np,
 23                void (*hndlr)(struct net_device *), u32 flags,
 24                phy_interface_t iface);
 25 struct phy_device *
 26 of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
 27                        void (*hndlr)(struct net_device *));
 28 struct phy_device *
 29 of_phy_attach(struct net_device *dev, struct device_node *phy_np,
 30               u32 flags, phy_interface_t iface);
 31 
 32 struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
 33 int of_phy_register_fixed_link(struct device_node *np);
 34 void of_phy_deregister_fixed_link(struct device_node *np);
 35 bool of_phy_is_fixed_link(struct device_node *np);
 36 int of_mdiobus_phy_device_register(struct mii_bus *mdio, struct phy_device *phy,
 37                                    struct device_node *child, u32 addr);
 38 
 39 static inline int of_mdio_parse_addr(struct device *dev,
 40                                      const struct device_node *np)
 41 {
 42         u32 addr;
 43         int ret;
 44 
 45         ret = of_property_read_u32(np, "reg", &addr);
 46         if (ret < 0) {
 47                 dev_err(dev, "%s has invalid PHY address\n", np->full_name);
 48                 return ret;
 49         }
 50 
 51         /* A PHY must have a reg property in the range [0-31] */
 52         if (addr >= PHY_MAX_ADDR) {
 53                 dev_err(dev, "%s PHY address %i is too large\n",
 54                         np->full_name, addr);
 55                 return -EINVAL;
 56         }
 57 
 58         return addr;
 59 }
 60 
 61 #else /* CONFIG_OF_MDIO */
 62 static inline bool of_mdiobus_child_is_phy(struct device_node *child)
 63 {
 64         return false;
 65 }
 66 
 67 static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 68 {
 69         /*
 70          * Fall back to the non-DT function to register a bus.
 71          * This way, we don't have to keep compat bits around in drivers.
 72          */
 73 
 74         return mdiobus_register(mdio);
 75 }
 76 
 77 static inline struct phy_device *of_phy_find_device(struct device_node *phy_np)
 78 {
 79         return NULL;
 80 }
 81 
 82 static inline struct phy_device *of_phy_connect(struct net_device *dev,
 83                                                 struct device_node *phy_np,
 84                                                 void (*hndlr)(struct net_device *),
 85                                                 u32 flags, phy_interface_t iface)
 86 {
 87         return NULL;
 88 }
 89 
 90 static inline struct phy_device *
 91 of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
 92                        void (*hndlr)(struct net_device *))
 93 {
 94         return NULL;
 95 }
 96 
 97 static inline struct phy_device *of_phy_attach(struct net_device *dev,
 98                                                struct device_node *phy_np,
 99                                                u32 flags, phy_interface_t iface)
100 {
101         return NULL;
102 }
103 
104 static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
105 {
106         return NULL;
107 }
108 
109 static inline int of_mdio_parse_addr(struct device *dev,
110                                      const struct device_node *np)
111 {
112         return -ENOSYS;
113 }
114 static inline int of_phy_register_fixed_link(struct device_node *np)
115 {
116         return -ENOSYS;
117 }
118 static inline void of_phy_deregister_fixed_link(struct device_node *np)
119 {
120 }
121 static inline bool of_phy_is_fixed_link(struct device_node *np)
122 {
123         return false;
124 }
125 
126 static inline int of_mdiobus_phy_device_register(struct mii_bus *mdio,
127                                             struct phy_device *phy,
128                                             struct device_node *child, u32 addr)
129 {
130         return -ENOSYS;
131 }
132 #endif
133 
134 
135 #endif /* __LINUX_OF_MDIO_H */
136 

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