1 // SPDX-License-Identifier: GPL-2.0-only
3 * OF helpers for network devices.
5 * Initially copied out of arch/powerpc/kernel/prom_parse.c
7 #include <linux/etherdevice.h>
8 #include <linux/kernel.h>
9 #include <linux/of_net.h>
10 #include <linux/of_platform.h>
11 #include <linux/platform_device.h>
12 #include <linux/phy.h>
13 #include <linux/export.h>
14 #include <linux/device.h>
15 #include <linux/nvmem-consumer.h>
18 * of_get_phy_mode - Get phy mode for given device_node
19 * @np: Pointer to the given device_node
20 * @interface: Pointer to the result
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
24 * interface and 0 returned. In case of error interface is set to
25 * PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
27 int of_get_phy_mode(struct device_node *np, phy_interface_t *interface)
32 *interface = PHY_INTERFACE_MODE_NA;
34 err = of_property_read_string(np, "phy-mode", &pm);
36 err = of_property_read_string(np, "phy-connection-type", &pm);
40 for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
41 if (!strcasecmp(pm, phy_modes(i))) {
48 EXPORT_SYMBOL_GPL(of_get_phy_mode);
50 static int of_get_mac_addr(struct device_node *np, const char *name, u8 *addr)
52 struct property *pp = of_find_property(np, name, NULL);
54 if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) {
55 memcpy(addr, pp->value, ETH_ALEN);
61 int of_get_mac_address_nvmem(struct device_node *np, u8 *addr)
63 struct platform_device *pdev = of_find_device_by_node(np);
64 struct nvmem_cell *cell;
69 /* Try lookup by device first, there might be a nvmem_cell_lookup
70 * associated with a given device.
73 ret = nvmem_get_mac_address(&pdev->dev, addr);
74 put_device(&pdev->dev);
78 cell = of_nvmem_cell_get(np, "mac-address");
82 mac = nvmem_cell_read(cell, &len);
88 if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
93 memcpy(addr, mac, ETH_ALEN);
98 EXPORT_SYMBOL(of_get_mac_address_nvmem);
101 * of_get_mac_address()
102 * @np: Caller's Device Node
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
113 * Note that the 'address' property is supposed to contain a virtual address of
114 * the register set, but some DTS files have redefined that property to be the
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
124 * Return: 0 on success and errno in case of error.
126 int of_get_mac_address(struct device_node *np, u8 *addr)
133 ret = of_get_mac_addr(np, "mac-address", addr);
137 ret = of_get_mac_addr(np, "local-mac-address", addr);
141 ret = of_get_mac_addr(np, "address", addr);
145 return of_get_mac_address_nvmem(np, addr);
147 EXPORT_SYMBOL(of_get_mac_address);
150 * of_get_ethdev_address()
151 * @np: Caller's Device Node
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.
157 * See documentation of of_get_mac_address() for more information on how
158 * the best address is determined.
160 * Return: 0 on success and errno in case of error.
162 int of_get_ethdev_address(struct device_node *np, struct net_device *dev)
167 ret = of_get_mac_address(np, addr);
169 eth_hw_addr_set(dev, addr);
172 EXPORT_SYMBOL(of_get_ethdev_address);