blob: 73e14184aafebbefa9f9eccc203bd43a8c519975 [file] [log] [blame]
David Daney4b6ba8a2010-10-26 15:07:13 -07001/*
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>
Shawn Guo6ca1a112011-07-04 14:03:17 +080011#include <linux/phy.h>
Paul Gortmaker2c8d6672011-07-29 16:05:38 +100012#include <linux/export.h>
Shawn Guo6ca1a112011-07-04 14:03:17 +080013
14/**
Shawn Guo6ca1a112011-07-04 14:03:17 +080015 * of_get_phy_mode - Get phy mode for given device_node
16 * @np: Pointer to the given device_node
17 *
Florian Fainellicf4c9eb2013-11-15 06:23:32 +000018 * 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.
Shawn Guo6ca1a112011-07-04 14:03:17 +080021 */
Geert Uytterhoeven7e0bdf12013-08-18 13:01:30 +020022int of_get_phy_mode(struct device_node *np)
Shawn Guo6ca1a112011-07-04 14:03:17 +080023{
24 const char *pm;
25 int err, i;
26
27 err = of_property_read_string(np, "phy-mode", &pm);
28 if (err < 0)
Florian Fainellicf4c9eb2013-11-15 06:23:32 +000029 err = of_property_read_string(np, "phy-connection-type", &pm);
30 if (err < 0)
Shawn Guo6ca1a112011-07-04 14:03:17 +080031 return err;
32
Florian Fainelli8a2fe562014-02-11 17:27:39 -080033 for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
34 if (!strcasecmp(pm, phy_modes(i)))
Shawn Guo6ca1a112011-07-04 14:03:17 +080035 return i;
36
37 return -ENODEV;
38}
39EXPORT_SYMBOL_GPL(of_get_phy_mode);
David Daney4b6ba8a2010-10-26 15:07:13 -070040
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*/
59const 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}
77EXPORT_SYMBOL(of_get_mac_address);