LXR linux/drivers/of/of

   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 */
  22int 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}
  39EXPORT_SYMBOL_GPL(of_get_phy_mode);
  40
  41static 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
  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*/
  68const void *of_get_mac_address(struct device_node *np)
  69{
  70        const void *addr;
  71
  72        addr = of_get_mac_addr(np, "mac-address");
  73        if (addr)
  74                return addr;
  75
  76        addr = of_get_mac_addr(np, "local-mac-address");
  77        if (addr)
  78                return addr;
  79
  80        return of_get_mac_addr(np, "address");
  81}
  82EXPORT_SYMBOL(of_get_mac_address);
  83