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 */
120
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