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);