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/fwnode_mdio.h> 11 #include <linux/of.h> 12 #include <linux/phy.h> 13 #include <linux/pse-pd/pse.h> 14 15 MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>"); 16 MODULE_LICENSE("GPL"); 17 MODULE_DESCRIPTION("FWNODE MDIO bus (Ethernet PHY) accessors"); 18 19 static struct pse_control * 20 fwnode_find_pse_control(struct fwnode_handle *fwnode) 21 { 22 struct pse_control *psec; 23 struct device_node *np; 24 25 if (!IS_ENABLED(CONFIG_PSE_CONTROLLER)) 26 return NULL; 27 28 np = to_of_node(fwnode); 29 if (!np) 30 return NULL; 31 32 psec = of_pse_control_get(np); 33 if (PTR_ERR(psec) == -ENOENT) 34 return NULL; 35 36 return psec; 37 } 38 39 static struct mii_timestamper * 40 fwnode_find_mii_timestamper(struct fwnode_handle *fwnode) 41 { 42 struct of_phandle_args arg; 43 int err; 44 45 if (is_acpi_node(fwnode)) 46 return NULL; 47 48 err = of_parse_phandle_with_fixed_args(to_of_node(fwnode), 49 "timestamper", 1, 0, &arg); 50 if (err == -ENOENT) 51 return NULL; 52 else if (err) 53 return ERR_PTR(err); 54 55 if (arg.args_count != 1) 56 return ERR_PTR(-EINVAL); 57 58 return register_mii_timestamper(arg.np, arg.args[0]); 59 } 60 61 int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio, 62 struct phy_device *phy, 63 struct fwnode_handle *child, u32 addr) 64 { 65 int rc; 66 67 rc = fwnode_irq_get(child, 0); 68 /* Don't wait forever if the IRQ provider doesn't become available, 69 * just fall back to poll mode 70 */ 71 if (rc == -EPROBE_DEFER) 72 rc = driver_deferred_probe_check_state(&phy->mdio.dev); 73 if (rc == -EPROBE_DEFER) 74 return rc; 75 76 if (rc > 0) { 77 phy->irq = rc; 78 mdio->irq[addr] = rc; 79 } else { 80 phy->irq = mdio->irq[addr]; 81 } 82 83 if (fwnode_property_read_bool(child, "broken-turn-around")) 84 mdio->phy_ignore_ta_mask |= 1 << addr; 85 86 fwnode_property_read_u32(child, "reset-assert-us", 87 &phy->mdio.reset_assert_delay); 88 fwnode_property_read_u32(child, "reset-deassert-us", 89 &phy->mdio.reset_deassert_delay); 90 91 /* Associate the fwnode with the device structure so it 92 * can be looked up later 93 */ 94 fwnode_handle_get(child); 95 device_set_node(&phy->mdio.dev, child); 96 97 /* All data is now stored in the phy struct; 98 * register it 99 */ 100 rc = phy_device_register(phy); 101 if (rc) { 102 device_set_node(&phy->mdio.dev, NULL); 103 fwnode_handle_put(child); 104 return rc; 105 } 106 107 dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n", 108 child, addr); 109 return 0; 110 } 111 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register); 112 113 int fwnode_mdiobus_register_phy(struct mii_bus *bus, 114 struct fwnode_handle *child, u32 addr) 115 { 116 struct mii_timestamper *mii_ts = NULL; 117 struct pse_control *psec = NULL; 118 struct phy_device *phy; 119 bool is_c45; 120 u32 phy_id; 121 int rc; 122 123 psec = fwnode_find_pse_control(child); 124 if (IS_ERR(psec)) 125 return PTR_ERR(psec); 126 127 mii_ts = fwnode_find_mii_timestamper(child); 128 if (IS_ERR(mii_ts)) { 129 rc = PTR_ERR(mii_ts); 130 goto clean_pse; 131 } 132 133 is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"); 134 if (is_c45 || fwnode_get_phy_id(child, &phy_id)) 135 phy = get_phy_device(bus, addr, is_c45); 136 else 137 phy = phy_device_create(bus, addr, phy_id, 0, NULL); 138 if (IS_ERR(phy)) { 139 rc = PTR_ERR(phy); 140 goto clean_mii_ts; 141 } 142 143 if (is_acpi_node(child)) { 144 phy->irq = bus->irq[addr]; 145 146 /* Associate the fwnode with the device structure so it 147 * can be looked up later. 148 */ 149 phy->mdio.dev.fwnode = fwnode_handle_get(child); 150 151 /* All data is now stored in the phy struct, so register it */ 152 rc = phy_device_register(phy); 153 if (rc) { 154 phy->mdio.dev.fwnode = NULL; 155 fwnode_handle_put(child); 156 goto clean_phy; 157 } 158 } else if (is_of_node(child)) { 159 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr); 160 if (rc) 161 goto clean_phy; 162 } 163 164 phy->psec = psec; 165 166 /* phy->mii_ts may already be defined by the PHY driver. A 167 * mii_timestamper probed via the device tree will still have 168 * precedence. 169 */ 170 if (mii_ts) 171 phy->mii_ts = mii_ts; 172 173 return 0; 174 175 clean_phy: 176 phy_device_free(phy); 177 clean_mii_ts: 178 unregister_mii_timestamper(mii_ts); 179 clean_pse: 180 pse_control_put(psec); 181 182 return rc; 183 } 184 EXPORT_SYMBOL(fwnode_mdiobus_register_phy); 185