1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * fwnode helpers for the MDIO (Ethernet PHY) API 4 * 5 * This file provides helper functions for extracting PHY device information 6 * out of the fwnode and using it to populate an mii_bus. 7 */ 8 9 #include <linux/acpi.h> 10 #include <linux/dev_printk.h> 11 #include <linux/fwnode_mdio.h> 12 #include <linux/of.h> 13 #include <linux/phy.h> 14 #include <linux/pse-pd/pse.h> 15 16 MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>"); 17 MODULE_LICENSE("GPL"); 18 MODULE_DESCRIPTION("FWNODE MDIO bus (Ethernet PHY) accessors"); 19 20 static struct pse_control * 21 fwnode_find_pse_control(struct fwnode_handle *fwnode, 22 struct phy_device *phydev) 23 { 24 struct pse_control *psec; 25 struct device_node *np; 26 27 if (!IS_ENABLED(CONFIG_PSE_CONTROLLER)) 28 return NULL; 29 30 np = to_of_node(fwnode); 31 if (!np) 32 return NULL; 33 34 psec = of_pse_control_get(np, phydev); 35 if (PTR_ERR(psec) == -ENOENT) 36 return NULL; 37 38 return psec; 39 } 40 41 static struct mii_timestamper * 42 fwnode_find_mii_timestamper(struct fwnode_handle *fwnode) 43 { 44 struct mii_timestamper *mii_ts; 45 struct of_phandle_args arg; 46 int err; 47 48 if (is_acpi_node(fwnode)) 49 return NULL; 50 51 err = of_parse_phandle_with_fixed_args(to_of_node(fwnode), 52 "timestamper", 1, 0, &arg); 53 if (err == -ENOENT) 54 return NULL; 55 else if (err) 56 return ERR_PTR(err); 57 58 if (arg.args_count != 1) { 59 mii_ts = ERR_PTR(-EINVAL); 60 goto put_node; 61 } 62 63 mii_ts = register_mii_timestamper(arg.np, arg.args[0]); 64 65 put_node: 66 of_node_put(arg.np); 67 return mii_ts; 68 } 69 70 int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio, 71 struct phy_device *phy, 72 struct fwnode_handle *child, u32 addr) 73 { 74 int rc; 75 76 rc = fwnode_irq_get(child, 0); 77 /* Don't wait forever if the IRQ provider doesn't become available, 78 * just fall back to poll mode 79 */ 80 if (rc == -EPROBE_DEFER) 81 rc = driver_deferred_probe_check_state(&phy->mdio.dev); 82 if (rc == -EPROBE_DEFER) 83 return rc; 84 85 if (rc > 0) { 86 phy->irq = rc; 87 mdio->irq[addr] = rc; 88 } else { 89 phy->irq = mdio->irq[addr]; 90 } 91 92 if (fwnode_property_read_bool(child, "broken-turn-around")) 93 mdio->phy_ignore_ta_mask |= 1 << addr; 94 95 fwnode_property_read_u32(child, "reset-assert-us", 96 &phy->mdio.reset_assert_delay); 97 fwnode_property_read_u32(child, "reset-deassert-us", 98 &phy->mdio.reset_deassert_delay); 99 100 /* Associate the fwnode with the device structure so it 101 * can be looked up later 102 */ 103 fwnode_handle_get(child); 104 device_set_node(&phy->mdio.dev, child); 105 106 /* All data is now stored in the phy struct; 107 * register it 108 */ 109 rc = phy_device_register(phy); 110 if (rc) { 111 device_set_node(&phy->mdio.dev, NULL); 112 fwnode_handle_put(child); 113 return rc; 114 } 115 116 dev_dbg(&mdio->dev, "registered phy fwnode %pfw at address %i\n", 117 child, addr); 118 return 0; 119 } 120 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register); 121 122 int fwnode_mdiobus_register_phy(struct mii_bus *bus, 123 struct fwnode_handle *child, u32 addr) 124 { 125 struct mii_timestamper *mii_ts = NULL; 126 struct pse_control *psec = NULL; 127 struct phy_device *phy; 128 bool is_c45; 129 u32 phy_id; 130 int rc; 131 132 mii_ts = fwnode_find_mii_timestamper(child); 133 if (IS_ERR(mii_ts)) 134 return PTR_ERR(mii_ts); 135 136 is_c45 = fwnode_device_is_compatible(child, "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); 139 else 140 phy = phy_device_create(bus, addr, phy_id, 0, NULL); 141 if (IS_ERR(phy)) { 142 rc = PTR_ERR(phy); 143 goto clean_mii_ts; 144 } 145 146 if (is_acpi_node(child)) { 147 phy->irq = bus->irq[addr]; 148 149 /* Associate the fwnode with the device structure so it 150 * can be looked up later. 151 */ 152 phy->mdio.dev.fwnode = fwnode_handle_get(child); 153 154 /* All data is now stored in the phy struct, so register it */ 155 rc = phy_device_register(phy); 156 if (rc) { 157 phy->mdio.dev.fwnode = NULL; 158 fwnode_handle_put(child); 159 goto clean_phy; 160 } 161 } else if (is_of_node(child)) { 162 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr); 163 if (rc) 164 goto clean_phy; 165 } 166 167 psec = fwnode_find_pse_control(child, phy); 168 if (IS_ERR(psec)) { 169 rc = PTR_ERR(psec); 170 goto unregister_phy; 171 } 172 173 phy->psec = psec; 174 175 /* phy->mii_ts may already be defined by the PHY driver. A 176 * mii_timestamper probed via the device tree will still have 177 * precedence. 178 */ 179 if (mii_ts) 180 phy->mii_ts = mii_ts; 181 182 return 0; 183 184 unregister_phy: 185 if (is_acpi_node(child) || is_of_node(child)) 186 phy_device_remove(phy); 187 clean_phy: 188 phy_device_free(phy); 189 clean_mii_ts: 190 unregister_mii_timestamper(mii_ts); 191 192 return rc; 193 } 194 EXPORT_SYMBOL(fwnode_mdiobus_register_phy); 195