1 /*
2 * OF helpers for network devices.
3 *
4 * This file is released under the GPLv2
5 *
6 * Initially copied out of arch/powerpc/kernel/prom_parse.c
7 */
8 #include <linux/etherdevice.h>
9 #include <linux/kernel.h>
10 #include <linux/of_net.h>
11 #include <linux/phy.h>
12 #include <linux/export.h>
13
14 /**
15 * of_get_phy_mode - Get phy mode for given device_node
16 * @np: Pointer to the given device_node
17 *
18 * The function gets phy interface string from property 'phy-mode' or
19 * 'phy-connection-type', and return its index in phy_modes table, or errno in
20 * error case.
21 */
of_get_phy_mode(struct device_node * np)22 int of_get_phy_mode(struct device_node *np)
23 {
24 const char *pm;
25 int err, i;
26
27 err = of_property_read_string(np, "phy-mode", &pm);
28 if (err < 0)
29 err = of_property_read_string(np, "phy-connection-type", &pm);
30 if (err < 0)
31 return err;
32
33 for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
34 if (!strcasecmp(pm, phy_modes(i)))
35 return i;
36
37 return -ENODEV;
38 }
39 EXPORT_SYMBOL_GPL(of_get_phy_mode);
40
41 /**
42 * Search the device tree for the best MAC address to use. 'mac-address' is
43 * checked first, because that is supposed to contain to "most recent" MAC
44 * address. If that isn't set, then 'local-mac-address' is checked next,
45 * because that is the default address. If that isn't set, then the obsolete
46 * 'address' is checked, just in case we're using an old device tree.
47 *
48 * Note that the 'address' property is supposed to contain a virtual address of
49 * the register set, but some DTS files have redefined that property to be the
50 * MAC address.
51 *
52 * All-zero MAC addresses are rejected, because those could be properties that
53 * exist in the device tree, but were not set by U-Boot. For example, the
54 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
55 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
56 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
57 * but is all zeros.
58 */
of_get_mac_address(struct device_node * np)59 const void *of_get_mac_address(struct device_node *np)
60 {
61 struct property *pp;
62
63 pp = of_find_property(np, "mac-address", NULL);
64 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
65 return pp->value;
66
67 pp = of_find_property(np, "local-mac-address", NULL);
68 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
69 return pp->value;
70
71 pp = of_find_property(np, "address", NULL);
72 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
73 return pp->value;
74
75 return NULL;
76 }
77 EXPORT_SYMBOL(of_get_mac_address);
78