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 /* Associate the fwnode with the device structure so it 96 * can be looked up later 97 */ 98 fwnode_handle_get(child); 99 device_set_node(&phy->mdio.dev, child); 100 101 /* All data is now stored in the phy struct; 102 * register it 103 */ 104 rc = phy_device_register(phy); 105 if (rc) { 106 device_set_node(&phy->mdio.dev, NULL); 107 fwnode_handle_put(child); 108 return rc; 109 } 110 111 dev_dbg(&mdio->dev, "registered phy fwnode %pfw at address %i\n", 112 child, addr); 113 return 0; 114 } 115 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register); 116 117 int fwnode_mdiobus_register_phy(struct mii_bus *bus, 118 struct fwnode_handle *child, u32 addr) 119 { 120 struct mii_timestamper *mii_ts = NULL; 121 struct pse_control *psec = NULL; 122 struct phy_device *phy; 123 bool is_c45; 124 u32 phy_id; 125 int rc; 126 127 mii_ts = fwnode_find_mii_timestamper(child); 128 if (IS_ERR(mii_ts)) 129 return PTR_ERR(mii_ts); 130 131 is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"); 132 if (is_c45 || fwnode_get_phy_id(child, &phy_id)) 133 phy = get_phy_device(bus, addr, is_c45); 134 else 135 phy = phy_device_create(bus, addr, phy_id, 0, NULL); 136 if (IS_ERR(phy)) { 137 rc = PTR_ERR(phy); 138 goto clean_mii_ts; 139 } 140 141 if (is_acpi_node(child)) { 142 phy->irq = bus->irq[addr]; 143 144 /* Associate the fwnode with the device structure so it 145 * can be looked up later. 146 */ 147 phy->mdio.dev.fwnode = fwnode_handle_get(child); 148 149 /* All data is now stored in the phy struct, so register it */ 150 rc = phy_device_register(phy); 151 if (rc) { 152 phy->mdio.dev.fwnode = NULL; 153 fwnode_handle_put(child); 154 goto clean_phy; 155 } 156 } else if (is_of_node(child)) { 157 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr); 158 if (rc) 159 goto clean_phy; 160 } 161 162 psec = fwnode_find_pse_control(child, phy); 163 if (IS_ERR(psec)) { 164 rc = PTR_ERR(psec); 165 goto unregister_phy; 166 } 167 168 phy->psec = psec; 169 170 /* phy->mii_ts may already be defined by the PHY driver. A 171 * mii_timestamper probed via the device tree will still have 172 * precedence. 173 */ 174 if (mii_ts) 175 phy->mii_ts = mii_ts; 176 177 return 0; 178 179 unregister_phy: 180 if (is_acpi_node(child) || is_of_node(child)) 181 phy_device_remove(phy); 182 clean_phy: 183 phy_device_free(phy); 184 clean_mii_ts: 185 unregister_mii_timestamper(mii_ts); 186 187 return rc; 188 } 189 EXPORT_SYMBOL(fwnode_mdiobus_register_phy); 190