2 * OF helpers for the MDIO (Ethernet PHY) API
4 * Copyright (c) 2009 Secret Lab Technologies, Ltd.
6 * This file is released under the GPLv2
8 * This file provides helper functions for extracting PHY device information
9 * out of the OpenFirmware device tree and using it to populate an mii_bus.
12 #include <linux/kernel.h>
13 #include <linux/device.h>
14 #include <linux/netdevice.h>
15 #include <linux/err.h>
16 #include <linux/phy.h>
18 #include <linux/of_irq.h>
19 #include <linux/of_mdio.h>
20 #include <linux/module.h>
22 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
23 MODULE_LICENSE("GPL");
26 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
27 * @mdio: pointer to mii_bus structure
28 * @np: pointer to device_node of MDIO bus.
30 * This function registers the mii_bus structure and registers a phy_device
31 * for each child node of @np.
33 int of_mdiobus_register(struct mii_bus
*mdio
, struct device_node
*np
)
35 struct phy_device
*phy
;
36 struct device_node
*child
;
39 bool is_c45
, scanphys
= false;
42 /* Mask out all PHYs from auto probing. Instead the PHYs listed in
43 * the device tree are populated after the bus has been registered */
46 /* Clear all the IRQ properties */
48 for (i
=0; i
<PHY_MAX_ADDR
; i
++)
49 mdio
->irq
[i
] = PHY_POLL
;
51 mdio
->dev
.of_node
= np
;
53 /* Register the MDIO bus */
54 rc
= mdiobus_register(mdio
);
58 /* Loop over the child nodes and register a phy_device for each one */
59 for_each_available_child_of_node(np
, child
) {
60 /* A PHY must have a reg property in the range [0-31] */
61 paddr
= of_get_property(child
, "reg", &len
);
62 if (!paddr
|| len
< sizeof(*paddr
)) {
64 dev_err(&mdio
->dev
, "%s has invalid PHY address\n",
69 addr
= be32_to_cpup(paddr
);
71 dev_err(&mdio
->dev
, "%s PHY address %i is too large\n",
72 child
->full_name
, addr
);
77 mdio
->irq
[addr
] = irq_of_parse_and_map(child
, 0);
79 mdio
->irq
[addr
] = PHY_POLL
;
82 is_c45
= of_device_is_compatible(child
,
83 "ethernet-phy-ieee802.3-c45");
84 phy
= get_phy_device(mdio
, addr
, is_c45
);
86 if (!phy
|| IS_ERR(phy
)) {
87 phy
= phy_device_create(mdio
, addr
, 0, false, NULL
);
88 if (!phy
|| IS_ERR(phy
)) {
90 "error creating PHY at address %i\n",
96 /* Associate the OF node with the device structure so it
97 * can be looked up later */
99 phy
->dev
.of_node
= child
;
101 /* All data is now stored in the phy struct; register it */
102 rc
= phy_device_register(phy
);
104 phy_device_free(phy
);
109 dev_dbg(&mdio
->dev
, "registered phy %s at address %i\n",
116 /* auto scan for PHYs with empty reg property */
117 for_each_available_child_of_node(np
, child
) {
118 /* Skip PHYs with reg property set */
119 paddr
= of_get_property(child
, "reg", &len
);
123 is_c45
= of_device_is_compatible(child
,
124 "ethernet-phy-ieee802.3-c45");
126 for (addr
= 0; addr
< PHY_MAX_ADDR
; addr
++) {
127 /* skip already registered PHYs */
128 if (mdio
->phy_map
[addr
])
131 /* be noisy to encourage people to set reg property */
132 dev_info(&mdio
->dev
, "scan phy %s at address %i\n",
135 phy
= get_phy_device(mdio
, addr
, is_c45
);
136 if (!phy
|| IS_ERR(phy
))
141 irq_of_parse_and_map(child
, 0);
142 if (!mdio
->irq
[addr
])
143 mdio
->irq
[addr
] = PHY_POLL
;
146 /* Associate the OF node with the device structure so it
147 * can be looked up later */
149 phy
->dev
.of_node
= child
;
151 /* All data is now stored in the phy struct;
153 rc
= phy_device_register(phy
);
155 phy_device_free(phy
);
160 dev_info(&mdio
->dev
, "registered phy %s at address %i\n",
168 EXPORT_SYMBOL(of_mdiobus_register
);
170 /* Helper function for of_phy_find_device */
171 static int of_phy_match(struct device
*dev
, void *phy_np
)
173 return dev
->of_node
== phy_np
;
177 * of_phy_find_device - Give a PHY node, find the phy_device
178 * @phy_np: Pointer to the phy's device tree node
180 * Returns a pointer to the phy_device.
182 struct phy_device
*of_phy_find_device(struct device_node
*phy_np
)
188 d
= bus_find_device(&mdio_bus_type
, NULL
, phy_np
, of_phy_match
);
189 return d
? to_phy_device(d
) : NULL
;
191 EXPORT_SYMBOL(of_phy_find_device
);
194 * of_phy_connect - Connect to the phy described in the device tree
195 * @dev: pointer to net_device claiming the phy
196 * @phy_np: Pointer to device tree node for the PHY
197 * @hndlr: Link state callback for the network device
198 * @iface: PHY data interface type
200 * Returns a pointer to the phy_device if successful. NULL otherwise
202 struct phy_device
*of_phy_connect(struct net_device
*dev
,
203 struct device_node
*phy_np
,
204 void (*hndlr
)(struct net_device
*), u32 flags
,
205 phy_interface_t iface
)
207 struct phy_device
*phy
= of_phy_find_device(phy_np
);
212 return phy_connect_direct(dev
, phy
, hndlr
, iface
) ? NULL
: phy
;
214 EXPORT_SYMBOL(of_phy_connect
);
217 * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
218 * @dev: pointer to net_device claiming the phy
219 * @hndlr: Link state callback for the network device
220 * @iface: PHY data interface type
222 * This function is a temporary stop-gap and will be removed soon. It is
223 * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers. Do
224 * not call this function from new drivers.
226 struct phy_device
*of_phy_connect_fixed_link(struct net_device
*dev
,
227 void (*hndlr
)(struct net_device
*),
228 phy_interface_t iface
)
230 struct device_node
*net_np
;
231 char bus_id
[MII_BUS_ID_SIZE
+ 3];
232 struct phy_device
*phy
;
233 const __be32
*phy_id
;
236 if (!dev
->dev
.parent
)
239 net_np
= dev
->dev
.parent
->of_node
;
243 phy_id
= of_get_property(net_np
, "fixed-link", &sz
);
244 if (!phy_id
|| sz
< sizeof(*phy_id
))
247 sprintf(bus_id
, PHY_ID_FMT
, "fixed-0", be32_to_cpu(phy_id
[0]));
249 phy
= phy_connect(dev
, bus_id
, hndlr
, iface
);
250 return IS_ERR(phy
) ? NULL
: phy
;
252 EXPORT_SYMBOL(of_phy_connect_fixed_link
);