Commit | Line | Data |
---|---|---|
4b6ba8aa DD |
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> | |
6ca1a113 | 11 | #include <linux/phy.h> |
2c8d667a | 12 | #include <linux/export.h> |
6ca1a113 | 13 | |
6ca1a113 SG |
14 | /** |
15 | * of_get_phy_mode - Get phy mode for given device_node | |
16 | * @np: Pointer to the given device_node | |
17 | * | |
cf4c9eb5 FF |
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. | |
6ca1a113 | 21 | */ |
7e0bdf15 | 22 | int of_get_phy_mode(struct device_node *np) |
6ca1a113 SG |
23 | { |
24 | const char *pm; | |
25 | int err, i; | |
26 | ||
27 | err = of_property_read_string(np, "phy-mode", &pm); | |
cf4c9eb5 FF |
28 | if (err < 0) |
29 | err = of_property_read_string(np, "phy-connection-type", &pm); | |
6ca1a113 SG |
30 | if (err < 0) |
31 | return err; | |
32 | ||
8a2fe56e FF |
33 | for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) |
34 | if (!strcasecmp(pm, phy_modes(i))) | |
6ca1a113 SG |
35 | return i; |
36 | ||
37 | return -ENODEV; | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(of_get_phy_mode); | |
4b6ba8aa | 40 | |
3eb46a1d SS |
41 | static const void *of_get_mac_addr(struct device_node *np, const char *name) |
42 | { | |
43 | struct property *pp = of_find_property(np, name, NULL); | |
44 | ||
45 | if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) | |
46 | return pp->value; | |
47 | return NULL; | |
48 | } | |
49 | ||
4b6ba8aa DD |
50 | /** |
51 | * Search the device tree for the best MAC address to use. 'mac-address' is | |
52 | * checked first, because that is supposed to contain to "most recent" MAC | |
53 | * address. If that isn't set, then 'local-mac-address' is checked next, | |
54 | * because that is the default address. If that isn't set, then the obsolete | |
55 | * 'address' is checked, just in case we're using an old device tree. | |
56 | * | |
57 | * Note that the 'address' property is supposed to contain a virtual address of | |
58 | * the register set, but some DTS files have redefined that property to be the | |
59 | * MAC address. | |
60 | * | |
61 | * All-zero MAC addresses are rejected, because those could be properties that | |
62 | * exist in the device tree, but were not set by U-Boot. For example, the | |
63 | * DTS could define 'mac-address' and 'local-mac-address', with zero MAC | |
64 | * addresses. Some older U-Boots only initialized 'local-mac-address'. In | |
65 | * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists | |
66 | * but is all zeros. | |
67 | */ | |
68 | const void *of_get_mac_address(struct device_node *np) | |
69 | { | |
3eb46a1d | 70 | const void *addr; |
4b6ba8aa | 71 | |
3eb46a1d SS |
72 | addr = of_get_mac_addr(np, "mac-address"); |
73 | if (addr) | |
74 | return addr; | |
4b6ba8aa | 75 | |
3eb46a1d SS |
76 | addr = of_get_mac_addr(np, "local-mac-address"); |
77 | if (addr) | |
78 | return addr; | |
4b6ba8aa | 79 | |
3eb46a1d | 80 | return of_get_mac_addr(np, "address"); |
4b6ba8aa DD |
81 | } |
82 | EXPORT_SYMBOL(of_get_mac_address); |