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 = -ENODEV; 51 52 if (rc > 0) { 53 phy->irq = rc; 54 mdio->irq[addr] = rc; 55 } else { 56 phy->irq = mdio->irq[addr]; 57 } 58 59 if (fwnode_property_read_bool(child, "broken-turn-around")) 60 mdio->phy_ignore_ta_mask |= 1 << addr; 61 62 fwnode_property_read_u32(child, "reset-assert-us", 63 &phy->mdio.reset_assert_delay); 64 fwnode_property_read_u32(child, "reset-deassert-us", 65 &phy->mdio.reset_deassert_delay); 66 67 /* Associate the fwnode with the device structure so it 68 * can be looked up later 69 */ 70 fwnode_handle_get(child); 71 device_set_node(&phy->mdio.dev, child); 72 73 /* All data is now stored in the phy struct; 74 * register it 75 */ 76 rc = phy_device_register(phy); 77 if (rc) { 78 fwnode_handle_put(child); 79 return rc; 80 } 81 82 dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n", 83 child, addr); 84 return 0; 85 } 86 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register); 87 88 int fwnode_mdiobus_register_phy(struct mii_bus *bus, 89 struct fwnode_handle *child, u32 addr) 90 { 91 struct mii_timestamper *mii_ts = NULL; 92 struct phy_device *phy; 93 bool is_c45 = false; 94 u32 phy_id; 95 int rc; 96 97 mii_ts = fwnode_find_mii_timestamper(child); 98 if (IS_ERR(mii_ts)) 99 return PTR_ERR(mii_ts); 100 101 rc = fwnode_property_match_string(child, "compatible", 102 "ethernet-phy-ieee802.3-c45"); 103 if (rc >= 0) 104 is_c45 = true; 105 106 if (is_c45 || fwnode_get_phy_id(child, &phy_id)) 107 phy = get_phy_device(bus, addr, is_c45); 108 else 109 phy = phy_device_create(bus, addr, phy_id, 0, NULL); 110 if (IS_ERR(phy)) { 111 unregister_mii_timestamper(mii_ts); 112 return PTR_ERR(phy); 113 } 114 115 if (is_acpi_node(child)) { 116 phy->irq = bus->irq[addr]; 117 118 /* Associate the fwnode with the device structure so it 119 * can be looked up later. 120 */ 121 phy->mdio.dev.fwnode = child; 122 123 /* All data is now stored in the phy struct, so register it */ 124 rc = phy_device_register(phy); 125 if (rc) { 126 phy_device_free(phy); 127 fwnode_handle_put(phy->mdio.dev.fwnode); 128 return rc; 129 } 130 } else if (is_of_node(child)) { 131 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr); 132 if (rc) { 133 unregister_mii_timestamper(mii_ts); 134 phy_device_free(phy); 135 return rc; 136 } 137 } 138 139 /* phy->mii_ts may already be defined by the PHY driver. A 140 * mii_timestamper probed via the device tree will still have 141 * precedence. 142 */ 143 if (mii_ts) 144 phy->mii_ts = mii_ts; 145 return 0; 146 } 147 EXPORT_SYMBOL(fwnode_mdiobus_register_phy); 148