1 // SPDX-License-Identifier: GPL-2.0-only
7  * This file provides helper functions for extracting PHY device information
8  * out of the OpenFirmware device tree and using it to populate an mii_bus.
11 #include <linux/device.h>
30  * ethernet-phy-idAAAA.BBBB */
31 static int of_get_phy_id(struct device_node *device, u32 *phy_id)  in of_get_phy_id()  argument
33 	return fwnode_get_phy_id(of_fwnode_handle(device), phy_id);  in of_get_phy_id()
37 				   struct device_node *child, u32 addr)  in of_mdiobus_phy_device_register()  argument
41 						  addr);  in of_mdiobus_phy_device_register()
46 				    struct device_node *child, u32 addr)  in of_mdiobus_register_phy()  argument
48 	return fwnode_mdiobus_register_phy(mdio, of_fwnode_handle(child), addr);  in of_mdiobus_register_phy()
52 				      struct device_node *child, u32 addr)  in of_mdiobus_register_device()  argument
58 	mdiodev = mdio_device_create(mdio, addr);  in of_mdiobus_register_device()
62 	/* Associate the OF node with the device structure so it  in of_mdiobus_register_device()
66 	device_set_node(&mdiodev->dev, fwnode);  in of_mdiobus_register_device()
76 	dev_dbg(&mdio->dev, "registered mdio device %pOFn at address %i\n",  in of_mdiobus_register_device()
77 		child, addr);  in of_mdiobus_register_device()
88 	{ .compatible = "brcm,40nm-ephy" },
98 	{ .compatible = "moxa,moxart-rtl8201cp", },
104  * o Compatible string of "ethernet-phy-idX.X"
105  * o Compatible string of "ethernet-phy-ieee802.3-c45"
106  * o Compatible string of "ethernet-phy-ieee802.3-c22"
110  * A device which is not a phy is expected to have a compatible string
111  * indicating what sort of device it is.
117 	if (of_get_phy_id(child, &phy_id) != -EINVAL)  in of_mdiobus_child_is_phy()
120 	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))  in of_mdiobus_child_is_phy()
123 	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))  in of_mdiobus_child_is_phy()
141  * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
152 	int addr, rc;  in of_mdiobus_register()  local
159 		return -ENODEV;  in of_mdiobus_register()
162 	 * the device tree are populated after the bus has been registered */  in of_mdiobus_register()
163 	mdio->phy_mask = ~0;  in of_mdiobus_register()
165 	device_set_node(&mdio->dev, of_fwnode_handle(np));  in of_mdiobus_register()
168 	mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;  in of_mdiobus_register()
169 	of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);  in of_mdiobus_register()
170 	mdio->reset_post_delay_us = 0;  in of_mdiobus_register()
171 	of_property_read_u32(np, "reset-post-delay-us", &mdio->reset_post_delay_us);  in of_mdiobus_register()
180 		addr = of_mdio_parse_addr(&mdio->dev, child);  in of_mdiobus_register()
181 		if (addr < 0) {  in of_mdiobus_register()
187 			rc = of_mdiobus_register_phy(mdio, child, addr);  in of_mdiobus_register()
189 			rc = of_mdiobus_register_device(mdio, child, addr);  in of_mdiobus_register()
191 		if (rc == -ENODEV)  in of_mdiobus_register()
192 			dev_err(&mdio->dev,  in of_mdiobus_register()
193 				"MDIO device at address %d is missing.\n",  in of_mdiobus_register()
194 				addr);  in of_mdiobus_register()
208 		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {  in of_mdiobus_register()
210 			if (mdiobus_is_registered_device(mdio, addr))  in of_mdiobus_register()
214 			dev_info(&mdio->dev, "scan phy %pOFn at address %i\n",  in of_mdiobus_register()
215 				 child, addr);  in of_mdiobus_register()
218 				/* -ENODEV is the return code that PHYLIB has  in of_mdiobus_register()
222 				rc = of_mdiobus_register_phy(mdio, child, addr);  in of_mdiobus_register()
225 				if (rc != -ENODEV)  in of_mdiobus_register()
240  * of_mdio_find_device - Given a device tree node, find the mdio_device
241  * @np: pointer to the mdio_device's device tree node
244  * struct device refcount incremented by one, or NULL on failure.
254  * of_phy_find_device - Give a PHY node, find the phy_device
255  * @phy_np: Pointer to the phy's device tree node
258  * struct device refcount incremented by one, or NULL on failure.
267  * of_phy_connect - Connect to the phy described in the device tree
269  * @phy_np: Pointer to device tree node for the PHY
270  * @hndlr: Link state callback for the network device
275  * struct device refcount incremented by one, or NULL on failure. The
289 	phy->dev_flags |= flags;  in of_phy_connect()
294 	put_device(&phy->mdio.dev);  in of_phy_connect()
302  * - Get phy node and connect to the phy described in the device tree
304  * @np: Pointer to device tree node for the net_device claiming the phy
305  * @hndlr: Link state callback for the network device
308  * struct device refcount incremented by one, or NULL on failure. The
326 			netdev_err(dev, "broken fixed-link specification\n");  in of_phy_get_and_connect()
331 		phy_np = of_parse_phandle(np, "phy-handle", 0);  in of_phy_get_and_connect()
347  * - the old DT binding, where 'fixed-link' was a property with 5
349  * - the new DT binding, where 'fixed-link' is a sub-node of the
350  *   Ethernet device.
359 	dn = of_get_child_by_name(np, "fixed-link");  in of_phy_is_fixed_link()
370 	if (of_get_property(np, "fixed-link", &len) &&  in of_phy_is_fixed_link()
386 	    strcmp(managed, "in-band-status") == 0) {  in of_phy_register_fixed_link()
392 	fixed_link_node = of_get_child_by_name(np, "fixed-link");  in of_phy_register_fixed_link()
396 						      "full-duplex");  in of_phy_register_fixed_link()
400 			return -EINVAL;  in of_phy_register_fixed_link()
404 							  "asym-pause");  in of_phy_register_fixed_link()
411 	if (of_property_read_u32_array(np, "fixed-link", fixed_link_prop,  in of_phy_register_fixed_link()
421 	return -ENODEV;  in of_phy_register_fixed_link()
438 	put_device(&phydev->mdio.dev);	/* of_phy_find_device() */  in of_phy_deregister_fixed_link()