1 // SPDX-License-Identifier: GPL-2.0-only
3 * fwnode helpers for the MDIO (Ethernet PHY) API
5 * This file provides helper functions for extracting PHY device information
6 * out of the fwnode and using it to populate an mii_bus.
9 #include <linux/acpi.h>
10 #include <linux/fwnode_mdio.h>
12 #include <linux/phy.h>
13 #include <linux/pse-pd/pse.h>
16 MODULE_LICENSE("GPL");
18 static struct pse_control *
19 fwnode_find_pse_control(struct fwnode_handle *fwnode)
21 struct pse_control *psec;
22 struct device_node *np;
24 if (!IS_ENABLED(CONFIG_PSE_CONTROLLER))
27 np = to_of_node(fwnode);
31 psec = of_pse_control_get(np);
32 if (PTR_ERR(psec) == -ENOENT)
38 static struct mii_timestamper *
39 fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
41 struct of_phandle_args arg;
44 if (is_acpi_node(fwnode))
47 err = of_parse_phandle_with_fixed_args(to_of_node(fwnode),
48 "timestamper", 1, 0, &arg);
54 if (arg.args_count != 1)
55 return ERR_PTR(-EINVAL);
57 return register_mii_timestamper(arg.np, arg.args[0]);
60 int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
61 struct phy_device *phy,
62 struct fwnode_handle *child, u32 addr)
66 rc = fwnode_irq_get(child, 0);
67 /* Don't wait forever if the IRQ provider doesn't become available,
68 * just fall back to poll mode
70 if (rc == -EPROBE_DEFER)
71 rc = driver_deferred_probe_check_state(&phy->mdio.dev);
72 if (rc == -EPROBE_DEFER)
79 phy->irq = mdio->irq[addr];
82 if (fwnode_property_read_bool(child, "broken-turn-around"))
83 mdio->phy_ignore_ta_mask |= 1 << addr;
85 fwnode_property_read_u32(child, "reset-assert-us",
86 &phy->mdio.reset_assert_delay);
87 fwnode_property_read_u32(child, "reset-deassert-us",
88 &phy->mdio.reset_deassert_delay);
90 /* Associate the fwnode with the device structure so it
91 * can be looked up later
93 fwnode_handle_get(child);
94 device_set_node(&phy->mdio.dev, child);
96 /* All data is now stored in the phy struct;
99 rc = phy_device_register(phy);
101 device_set_node(&phy->mdio.dev, NULL);
102 fwnode_handle_put(child);
106 dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n",
110 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register);
112 int fwnode_mdiobus_register_phy(struct mii_bus *bus,
113 struct fwnode_handle *child, u32 addr)
115 struct mii_timestamper *mii_ts = NULL;
116 struct pse_control *psec = NULL;
117 struct phy_device *phy;
122 psec = fwnode_find_pse_control(child);
124 return PTR_ERR(psec);
126 mii_ts = fwnode_find_mii_timestamper(child);
127 if (IS_ERR(mii_ts)) {
128 rc = PTR_ERR(mii_ts);
132 rc = fwnode_property_match_string(child, "compatible",
133 "ethernet-phy-ieee802.3-c45");
137 if (is_c45 || fwnode_get_phy_id(child, &phy_id))
138 phy = get_phy_device(bus, addr, is_c45);
140 phy = phy_device_create(bus, addr, phy_id, 0, NULL);
146 if (is_acpi_node(child)) {
147 phy->irq = bus->irq[addr];
149 /* Associate the fwnode with the device structure so it
150 * can be looked up later.
152 phy->mdio.dev.fwnode = fwnode_handle_get(child);
154 /* All data is now stored in the phy struct, so register it */
155 rc = phy_device_register(phy);
157 phy->mdio.dev.fwnode = NULL;
158 fwnode_handle_put(child);
161 } else if (is_of_node(child)) {
162 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr);
169 /* phy->mii_ts may already be defined by the PHY driver. A
170 * mii_timestamper probed via the device tree will still have
174 phy->mii_ts = mii_ts;
179 phy_device_free(phy);
181 unregister_mii_timestamper(mii_ts);
183 pse_control_put(psec);
187 EXPORT_SYMBOL(fwnode_mdiobus_register_phy);