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>
17 #include <linux/phy_fixed.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_mdio.h>
21 #include <linux/module.h>
23 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
24 MODULE_LICENSE("GPL");
26 /* Extract the clause 22 phy ID from the compatible string of the form
27 * ethernet-phy-idAAAA.BBBB */
28 static int of_get_phy_id(struct device_node *device, u32 *phy_id)
30 struct property *prop;
32 unsigned int upper, lower;
34 of_property_for_each_string(device, "compatible", prop, cp) {
35 if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
36 *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
43 static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *child,
46 struct phy_device *phy;
51 is_c45 = of_device_is_compatible(child,
52 "ethernet-phy-ieee802.3-c45");
54 if (!is_c45 && !of_get_phy_id(child, &phy_id))
55 phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
57 phy = get_phy_device(mdio, addr, is_c45);
58 if (!phy || IS_ERR(phy))
61 rc = irq_of_parse_and_map(child, 0);
68 phy->irq = mdio->irq[addr];
71 /* Associate the OF node with the device structure so it
72 * can be looked up later */
74 phy->dev.of_node = child;
76 /* All data is now stored in the phy struct;
78 rc = phy_device_register(phy);
85 dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
92 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
93 * @mdio: pointer to mii_bus structure
94 * @np: pointer to device_node of MDIO bus.
96 * This function registers the mii_bus structure and registers a phy_device
97 * for each child node of @np.
99 int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
101 struct device_node *child;
104 bool scanphys = false;
107 /* Mask out all PHYs from auto probing. Instead the PHYs listed in
108 * the device tree are populated after the bus has been registered */
111 /* Clear all the IRQ properties */
113 for (i=0; i<PHY_MAX_ADDR; i++)
114 mdio->irq[i] = PHY_POLL;
116 mdio->dev.of_node = np;
118 /* Register the MDIO bus */
119 rc = mdiobus_register(mdio);
123 /* Loop over the child nodes and register a phy_device for each one */
124 for_each_available_child_of_node(np, child) {
125 /* A PHY must have a reg property in the range [0-31] */
126 paddr = of_get_property(child, "reg", &len);
127 if (!paddr || len < sizeof(*paddr)) {
129 dev_err(&mdio->dev, "%s has invalid PHY address\n",
134 addr = be32_to_cpup(paddr);
135 if (addr >= PHY_MAX_ADDR) {
136 dev_err(&mdio->dev, "%s PHY address %i is too large\n",
137 child->full_name, addr);
141 rc = of_mdiobus_register_phy(mdio, child, addr);
149 /* auto scan for PHYs with empty reg property */
150 for_each_available_child_of_node(np, child) {
151 /* Skip PHYs with reg property set */
152 paddr = of_get_property(child, "reg", &len);
156 for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
157 /* skip already registered PHYs */
158 if (mdio->phy_map[addr])
161 /* be noisy to encourage people to set reg property */
162 dev_info(&mdio->dev, "scan phy %s at address %i\n",
165 rc = of_mdiobus_register_phy(mdio, child, addr);
173 EXPORT_SYMBOL(of_mdiobus_register);
175 /* Helper function for of_phy_find_device */
176 static int of_phy_match(struct device *dev, void *phy_np)
178 return dev->of_node == phy_np;
182 * of_phy_find_device - Give a PHY node, find the phy_device
183 * @phy_np: Pointer to the phy's device tree node
185 * Returns a pointer to the phy_device.
187 struct phy_device *of_phy_find_device(struct device_node *phy_np)
193 d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
194 return d ? to_phy_device(d) : NULL;
196 EXPORT_SYMBOL(of_phy_find_device);
199 * of_phy_connect - Connect to the phy described in the device tree
200 * @dev: pointer to net_device claiming the phy
201 * @phy_np: Pointer to device tree node for the PHY
202 * @hndlr: Link state callback for the network device
203 * @iface: PHY data interface type
205 * Returns a pointer to the phy_device if successful. NULL otherwise
207 struct phy_device *of_phy_connect(struct net_device *dev,
208 struct device_node *phy_np,
209 void (*hndlr)(struct net_device *), u32 flags,
210 phy_interface_t iface)
212 struct phy_device *phy = of_phy_find_device(phy_np);
217 return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy;
219 EXPORT_SYMBOL(of_phy_connect);
222 * of_phy_attach - Attach to a PHY without starting the state machine
223 * @dev: pointer to net_device claiming the phy
224 * @phy_np: Node pointer for the PHY
225 * @flags: flags to pass to the PHY
226 * @iface: PHY data interface type
228 struct phy_device *of_phy_attach(struct net_device *dev,
229 struct device_node *phy_np, u32 flags,
230 phy_interface_t iface)
232 struct phy_device *phy = of_phy_find_device(phy_np);
237 return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy;
239 EXPORT_SYMBOL(of_phy_attach);
241 #if defined(CONFIG_FIXED_PHY)
243 * of_phy_is_fixed_link() and of_phy_register_fixed_link() must
244 * support two DT bindings:
245 * - the old DT binding, where 'fixed-link' was a property with 5
246 * cells encoding various informations about the fixed PHY
247 * - the new DT binding, where 'fixed-link' is a sub-node of the
250 bool of_phy_is_fixed_link(struct device_node *np)
252 struct device_node *dn;
256 dn = of_get_child_by_name(np, "fixed-link");
263 if (of_get_property(np, "fixed-link", &len) &&
264 len == (5 * sizeof(__be32)))
269 EXPORT_SYMBOL(of_phy_is_fixed_link);
271 int of_phy_register_fixed_link(struct device_node *np)
273 struct fixed_phy_status status = {};
274 struct device_node *fixed_link_node;
275 const __be32 *fixed_link_prop;
279 fixed_link_node = of_get_child_by_name(np, "fixed-link");
280 if (fixed_link_node) {
282 status.duplex = of_property_read_bool(np, "full-duplex");
283 if (of_property_read_u32(fixed_link_node, "speed", &status.speed))
285 status.pause = of_property_read_bool(np, "pause");
286 status.asym_pause = of_property_read_bool(np, "asym-pause");
287 of_node_put(fixed_link_node);
288 return fixed_phy_register(PHY_POLL, &status, np);
292 fixed_link_prop = of_get_property(np, "fixed-link", &len);
293 if (fixed_link_prop && len == (5 * sizeof(__be32))) {
295 status.duplex = be32_to_cpu(fixed_link_prop[1]);
296 status.speed = be32_to_cpu(fixed_link_prop[2]);
297 status.pause = be32_to_cpu(fixed_link_prop[3]);
298 status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
299 return fixed_phy_register(PHY_POLL, &status, np);
304 EXPORT_SYMBOL(of_phy_register_fixed_link);