tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 * It maps 'enum phy_interface_t' found in include/linux/phy.h
16 * into the device tree binding of 'phy-mode', so that Ethernet
17 * device driver can get phy interface from device tree.
18 */
19static const char *phy_modes[] = {
20 [PHY_INTERFACE_MODE_NA] = "",
21 [PHY_INTERFACE_MODE_MII] = "mii",
22 [PHY_INTERFACE_MODE_GMII] = "gmii",
23 [PHY_INTERFACE_MODE_SGMII] = "sgmii",
24 [PHY_INTERFACE_MODE_TBI] = "tbi",
25 [PHY_INTERFACE_MODE_REVMII] = "rev-mii",
26 [PHY_INTERFACE_MODE_RMII] = "rmii",
27 [PHY_INTERFACE_MODE_RGMII] = "rgmii",
28 [PHY_INTERFACE_MODE_RGMII_ID] = "rgmii-id",
29 [PHY_INTERFACE_MODE_RGMII_RXID] = "rgmii-rxid",
30 [PHY_INTERFACE_MODE_RGMII_TXID] = "rgmii-txid",
31 [PHY_INTERFACE_MODE_RTBI] = "rtbi",
32 [PHY_INTERFACE_MODE_SMII] = "smii",
33};
34
35/**
36 * of_get_phy_mode - Get phy mode for given device_node
37 * @np: Pointer to the given device_node
38 *
39 * The function gets phy interface string from property 'phy-mode',
40 * and return its index in phy_modes table, or errno in error case.
41 */
42int of_get_phy_mode(struct device_node *np)
43{
44 const char *pm;
45 int err, i;
46
47 err = of_property_read_string(np, "phy-mode", &pm);
48 if (err < 0)
49 return err;
50
51 for (i = 0; i < ARRAY_SIZE(phy_modes); i++)
52 if (!strcasecmp(pm, phy_modes[i]))
53 return i;
54
55 return -ENODEV;
56}
57EXPORT_SYMBOL_GPL(of_get_phy_mode);
58
59/**
60 * Search the device tree for the best MAC address to use. 'mac-address' is
61 * checked first, because that is supposed to contain to "most recent" MAC
62 * address. If that isn't set, then 'local-mac-address' is checked next,
63 * because that is the default address. If that isn't set, then the obsolete
64 * 'address' is checked, just in case we're using an old device tree.
65 *
66 * Note that the 'address' property is supposed to contain a virtual address of
67 * the register set, but some DTS files have redefined that property to be the
68 * MAC address.
69 *
70 * All-zero MAC addresses are rejected, because those could be properties that
71 * exist in the device tree, but were not set by U-Boot. For example, the
72 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
73 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
74 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
75 * but is all zeros.
76*/
77const void *of_get_mac_address(struct device_node *np)
78{
79 struct property *pp;
80
81 pp = of_find_property(np, "mac-address", NULL);
82 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
83 return pp->value;
84
85 pp = of_find_property(np, "local-mac-address", NULL);
86 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
87 return pp->value;
88
89 pp = of_find_property(np, "address", NULL);
90 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
91 return pp->value;
92
93 return NULL;
94}
95EXPORT_SYMBOL(of_get_mac_address);