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 if (rc == -EPROBE_DEFER) 47 return rc; 48 49 if (rc > 0) { 50 phy->irq = rc; 51 mdio->irq[addr] = rc; 52 } else { 53 phy->irq = mdio->irq[addr]; 54 } 55 56 if (fwnode_property_read_bool(child, "broken-turn-around")) 57 mdio->phy_ignore_ta_mask |= 1 << addr; 58 59 fwnode_property_read_u32(child, "reset-assert-us", 60 &phy->mdio.reset_assert_delay); 61 fwnode_property_read_u32(child, "reset-deassert-us", 62 &phy->mdio.reset_deassert_delay); 63 64 /* Associate the fwnode with the device structure so it 65 * can be looked up later 66 */ 67 fwnode_handle_get(child); 68 device_set_node(&phy->mdio.dev, child); 69 70 /* All data is now stored in the phy struct; 71 * register it 72 */ 73 rc = phy_device_register(phy); 74 if (rc) { 75 fwnode_handle_put(child); 76 return rc; 77 } 78 79 dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n", 80 child, addr); 81 return 0; 82 } 83 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register); 84 85 int fwnode_mdiobus_register_phy(struct mii_bus *bus, 86 struct fwnode_handle *child, u32 addr) 87 { 88 struct mii_timestamper *mii_ts = NULL; 89 struct phy_device *phy; 90 bool is_c45 = false; 91 u32 phy_id; 92 int rc; 93 94 mii_ts = fwnode_find_mii_timestamper(child); 95 if (IS_ERR(mii_ts)) 96 return PTR_ERR(mii_ts); 97 98 rc = fwnode_property_match_string(child, "compatible", 99 "ethernet-phy-ieee802.3-c45"); 100 if (rc >= 0) 101 is_c45 = true; 102 103 if (is_c45 || fwnode_get_phy_id(child, &phy_id)) 104 phy = get_phy_device(bus, addr, is_c45); 105 else 106 phy = phy_device_create(bus, addr, phy_id, 0, NULL); 107 if (IS_ERR(phy)) { 108 unregister_mii_timestamper(mii_ts); 109 return PTR_ERR(phy); 110 } 111 112 if (is_acpi_node(child)) { 113 phy->irq = bus->irq[addr]; 114 115 /* Associate the fwnode with the device structure so it 116 * can be looked up later. 117 */ 118 phy->mdio.dev.fwnode = child; 119 120 /* All data is now stored in the phy struct, so register it */ 121 rc = phy_device_register(phy); 122 if (rc) { 123 phy_device_free(phy); 124 fwnode_handle_put(phy->mdio.dev.fwnode); 125 return rc; 126 } 127 } else if (is_of_node(child)) { 128 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr); 129 if (rc) { 130 unregister_mii_timestamper(mii_ts); 131 phy_device_free(phy); 132 return rc; 133 } 134 } 135 136 /* phy->mii_ts may already be defined by the PHY driver. A 137 * mii_timestamper probed via the device tree will still have 138 * precedence. 139 */ 140 if (mii_ts) 141 phy->mii_ts = mii_ts; 142 return 0; 143 } 144 EXPORT_SYMBOL(fwnode_mdiobus_register_phy); 145