net/core/of_net.c

1 // SPDX-License-Identifier: GPL-2.0-only
15 #include <linux/nvmem-consumer.h>
18  * of_get_phy_mode - Get phy mode for given device_node
22  * The function gets phy interface string from property 'phy-mode' or
23  * 'phy-connection-type'. The index in phy_modes table is set in
25  * PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
34 	err = of_property_read_string(np, "phy-mode", &pm);  in of_get_phy_mode()
36 		err = of_property_read_string(np, "phy-connection-type", &pm);  in of_get_phy_mode()
46 	return -ENODEV;  in of_get_phy_mode()
54 	if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) {  in of_get_mac_addr()
55 		memcpy(addr, pp->value, ETH_ALEN);  in of_get_mac_addr()
58 	return -ENODEV;  in of_get_mac_addr()
65 	const void *mac;  in of_get_mac_address_nvmem()  local
73 		ret = nvmem_get_mac_address(&pdev->dev, addr);  in of_get_mac_address_nvmem()
74 		put_device(&pdev->dev);  in of_get_mac_address_nvmem()
78 	cell = of_nvmem_cell_get(np, "mac-address");  in of_get_mac_address_nvmem()
82 	mac = nvmem_cell_read(cell, &len);  in of_get_mac_address_nvmem()
85 	if (IS_ERR(mac))  in of_get_mac_address_nvmem()
86 		return PTR_ERR(mac);  in of_get_mac_address_nvmem()
88 	if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {  in of_get_mac_address_nvmem()
89 		kfree(mac);  in of_get_mac_address_nvmem()
90 		return -EINVAL;  in of_get_mac_address_nvmem()
93 	memcpy(addr, mac, ETH_ALEN);  in of_get_mac_address_nvmem()
94 	kfree(mac);  in of_get_mac_address_nvmem()
103  * @addr:	Pointer to a six-byte array for the result
105  * Search the device tree for the best MAC address to use.  'mac-address' is
106  * checked first, because that is supposed to contain to "most recent" MAC
107  * address. If that isn't set, then 'local-mac-address' is checked next,
108  * because that is the default address. If that isn't set, then the obsolete
109  * 'address' is checked, just in case we're using an old device tree. If any
110  * of the above isn't set, then try to get MAC address from nvmem cell named
111  * 'mac-address'.
113  * Note that the 'address' property is supposed to contain a virtual address of
115  * MAC address.
117  * All-zero MAC addresses are rejected, because those could be properties that
118  * exist in the device tree, but were not set by U-Boot.  For example, the
119  * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
120  * addresses.  Some older U-Boots only initialized 'local-mac-address'.  In
121  * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
131 		return -ENODEV;  in of_get_mac_address()
133 	ret = of_get_mac_addr(np, "mac-address", addr);  in of_get_mac_address()
137 	ret = of_get_mac_addr(np, "local-mac-address", addr);  in of_get_mac_address()
141 	ret = of_get_mac_addr(np, "address", addr);  in of_get_mac_address()
152  * @dev:	Pointer to netdevice which address will be updated
154  * Search the device tree for the best MAC address to use.
155  * If found set @dev->dev_addr to that address.
158  * the best address is determined.