Linux kernel mirror (for testing)
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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/phy.h>
12#include <linux/of.h>
13
14#if IS_ENABLED(CONFIG_OF_MDIO)
15extern bool of_mdiobus_child_is_phy(struct device_node *child);
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 bool of_mdiobus_child_is_phy(struct device_node *child)
59{
60 return false;
61}
62
63static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
64{
65 /*
66 * Fall back to the non-DT function to register a bus.
67 * This way, we don't have to keep compat bits around in drivers.
68 */
69
70 return mdiobus_register(mdio);
71}
72
73static inline struct phy_device *of_phy_find_device(struct device_node *phy_np)
74{
75 return NULL;
76}
77
78static inline struct phy_device *of_phy_connect(struct net_device *dev,
79 struct device_node *phy_np,
80 void (*hndlr)(struct net_device *),
81 u32 flags, phy_interface_t iface)
82{
83 return NULL;
84}
85
86static inline struct phy_device *
87of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
88 void (*hndlr)(struct net_device *))
89{
90 return NULL;
91}
92
93static inline struct phy_device *of_phy_attach(struct net_device *dev,
94 struct device_node *phy_np,
95 u32 flags, phy_interface_t iface)
96{
97 return NULL;
98}
99
100static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
101{
102 return NULL;
103}
104
105static inline int of_mdio_parse_addr(struct device *dev,
106 const struct device_node *np)
107{
108 return -ENOSYS;
109}
110static inline int of_phy_register_fixed_link(struct device_node *np)
111{
112 return -ENOSYS;
113}
114static inline void of_phy_deregister_fixed_link(struct device_node *np)
115{
116}
117static inline bool of_phy_is_fixed_link(struct device_node *np)
118{
119 return false;
120}
121#endif
122
123
124#endif /* __LINUX_OF_MDIO_H */