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 /* Mask out all PHYs from auto probing. Instead the PHYs listed in
40 * the device tree are populated after the bus has been registered */
43 /* Clear all the IRQ properties */
45 for (i
=0; i
<PHY_MAX_ADDR
; i
++)
46 mdio
->irq
[i
] = PHY_POLL
;
48 mdio
->dev
.of_node
= np
;
50 /* Register the MDIO bus */
51 rc
= mdiobus_register(mdio
);
55 /* Loop over the child nodes and register a phy_device for each one */
56 for_each_child_of_node(np
, child
) {
61 /* A PHY must have a reg property in the range [0-31] */
62 paddr
= of_get_property(child
, "reg", &len
);
63 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 phy
= get_phy_device(mdio
, addr
);
83 if (!phy
|| IS_ERR(phy
)) {
84 dev_err(&mdio
->dev
, "error probing PHY at address %i\n",
89 /* Associate the OF node with the device structure so it
90 * can be looked up later */
92 phy
->dev
.of_node
= child
;
94 /* All data is now stored in the phy struct; register it */
95 rc
= phy_device_register(phy
);
102 dev_dbg(&mdio
->dev
, "registered phy %s at address %i\n",
108 EXPORT_SYMBOL(of_mdiobus_register
);
110 /* Helper function for of_phy_find_device */
111 static int of_phy_match(struct device
*dev
, void *phy_np
)
113 return dev
->of_node
== phy_np
;
117 * of_phy_find_device - Give a PHY node, find the phy_device
118 * @phy_np: Pointer to the phy's device tree node
120 * Returns a pointer to the phy_device.
122 struct phy_device
*of_phy_find_device(struct device_node
*phy_np
)
128 d
= bus_find_device(&mdio_bus_type
, NULL
, phy_np
, of_phy_match
);
129 return d
? to_phy_device(d
) : NULL
;
131 EXPORT_SYMBOL(of_phy_find_device
);
134 * of_phy_connect - Connect to the phy described in the device tree
135 * @dev: pointer to net_device claiming the phy
136 * @phy_np: Pointer to device tree node for the PHY
137 * @hndlr: Link state callback for the network device
138 * @iface: PHY data interface type
140 * Returns a pointer to the phy_device if successful. NULL otherwise
142 struct phy_device
*of_phy_connect(struct net_device
*dev
,
143 struct device_node
*phy_np
,
144 void (*hndlr
)(struct net_device
*), u32 flags
,
145 phy_interface_t iface
)
147 struct phy_device
*phy
= of_phy_find_device(phy_np
);
152 return phy_connect_direct(dev
, phy
, hndlr
, flags
, iface
) ? NULL
: phy
;
154 EXPORT_SYMBOL(of_phy_connect
);
157 * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
158 * @dev: pointer to net_device claiming the phy
159 * @hndlr: Link state callback for the network device
160 * @iface: PHY data interface type
162 * This function is a temporary stop-gap and will be removed soon. It is
163 * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers. Do
164 * not call this function from new drivers.
166 struct phy_device
*of_phy_connect_fixed_link(struct net_device
*dev
,
167 void (*hndlr
)(struct net_device
*),
168 phy_interface_t iface
)
170 struct device_node
*net_np
;
171 char bus_id
[MII_BUS_ID_SIZE
+ 3];
172 struct phy_device
*phy
;
173 const __be32
*phy_id
;
176 if (!dev
->dev
.parent
)
179 net_np
= dev
->dev
.parent
->of_node
;
183 phy_id
= of_get_property(net_np
, "fixed-link", &sz
);
184 if (!phy_id
|| sz
< sizeof(*phy_id
))
187 sprintf(bus_id
, PHY_ID_FMT
, "fixed-0", be32_to_cpu(phy_id
[0]));
189 phy
= phy_connect(dev
, bus_id
, hndlr
, 0, iface
);
190 return IS_ERR(phy
) ? NULL
: phy
;
192 EXPORT_SYMBOL(of_phy_connect_fixed_link
);