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)
16extern int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np);
17extern struct phy_device *of_phy_find_device(struct device_node *phy_np);
18extern 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);
22extern struct phy_device *
23of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
24 void (*hndlr)(struct net_device *));
25struct phy_device *of_phy_attach(struct net_device *dev,
26 struct device_node *phy_np, u32 flags,
27 phy_interface_t iface);
28
29extern struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
30extern int of_phy_register_fixed_link(struct device_node *np);
31extern void of_phy_deregister_fixed_link(struct device_node *np);
32extern bool of_phy_is_fixed_link(struct device_node *np);
33
34
35static 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 */
58static 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
68static inline struct phy_device *of_phy_find_device(struct device_node *phy_np)
69{
70 return NULL;
71}
72
73static 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
81static inline struct phy_device *
82of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
83 void (*hndlr)(struct net_device *))
84{
85 return NULL;
86}
87
88static 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
95static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
96{
97 return NULL;
98}
99
100static inline int of_mdio_parse_addr(struct device *dev,
101 const struct device_node *np)
102{
103 return -ENOSYS;
104}
105static inline int of_phy_register_fixed_link(struct device_node *np)
106{
107 return -ENOSYS;
108}
109static inline void of_phy_deregister_fixed_link(struct device_node *np)
110{
111}
112static 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