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