/**
* Search the device tree for the best MAC address to use. 'mac-address' is
* checked first, because that is supposed to contain to "most recent" MAC
* address. If that isn't set, then 'local-mac-address' is checked next,
* because that is the default address. If that isn't set, then the obsolete
* 'address' is checked, just in case we're using an old device tree.
*
* Note that the 'address' property is supposed to contain a virtual address of
* the register set, but some DTS files have redefined that property to be the
* MAC address.
*
* All-zero MAC addresses are rejected, because those could be properties that
* exist in the device tree, but were not set by U-Boot. For example, the
* DTS could define 'mac-address' and 'local-mac-address', with zero MAC
* addresses. Some older U-Boots only initialized 'local-mac-address'. In
* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
* but is all zeros.
*/
void *device_get_mac_address(struct device *dev, char *addr, int alen)
{
addr = device_get_mac_addr(dev, "mac-address", addr, alen);
if (addr)
return addr;
addr = device_get_mac_addr(dev, "local-mac-address", addr, alen);
if (addr)
return addr;
return device_get_mac_addr(dev, "address", addr, alen);
}
/**
* device_get_mac_address - Get the MAC for a given device
* @dev: Pointer to the device
* @addr: Address of buffer to store the MAC in
* @alen: Length of the buffer pointed to by addr, should be ETH_ALEN
*
* Search the firmware node for the best MAC address to use. 'mac-address' is
* checked first, because that is supposed to contain to "most recent" MAC
* address. If that isn't set, then 'local-mac-address' is checked next,
* because that is the default address. If that isn't set, then the obsolete
* 'address' is checked, just in case we're using an old device tree.
*
* Note that the 'address' property is supposed to contain a virtual address of
* the register set, but some DTS files have redefined that property to be the
* MAC address.
*
* All-zero MAC addresses are rejected, because those could be properties that
* exist in the firmware tables, but were not updated by the firmware. For
* example, the DTS could define 'mac-address' and 'local-mac-address', with
* zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'.
* In this case, the real MAC is in 'local-mac-address', and 'mac-address'
* exists but is all zeros.
*/
void *device_get_mac_address(struct device *dev, char *addr, int alen)
{
char *res;
res = device_get_mac_addr(dev, "mac-address", addr, alen);
if (res)
return res;
res = device_get_mac_addr(dev, "local-mac-address", addr, alen);
if (res)
return res;
return device_get_mac_addr(dev, "address", addr, alen);
}
