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/*
* OF helpers for network devices.
*
* This file is released under the GPLv2
*
* Initially copied out of arch/powerpc/kernel/prom_parse.c
*/
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/nvmem-consumer.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/export.h>
/**
* of_get_phy_mode - Get phy mode for given device_node
* @np: Pointer to the given device_node
*
* The function gets phy interface string from property 'phy-mode' or
* 'phy-connection-type', and return its index in phy_modes table, or errno in
* error case.
*/
int of_get_phy_mode(struct device_node *np)
{
const char *pm;
int err, i;
err = of_property_read_string(np, "phy-mode", &pm);
if (err < 0)
err = of_property_read_string(np, "phy-connection-type", &pm);
if (err < 0)
return err;
for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
if (!strcasecmp(pm, phy_modes(i)))
return i;
return -ENODEV;
}
EXPORT_SYMBOL_GPL(of_get_phy_mode);
static const void *of_get_mac_addr(struct device_node *np, const char *name)
{
struct property *pp = of_find_property(np, name, NULL);
if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value))
return pp->value;
return NULL;
}
/**
* 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.
*/
const void *of_get_mac_address(struct device_node *np)
{
const void *addr;
addr = of_get_mac_addr(np, "mac-address");
if (addr)
return addr;
addr = of_get_mac_addr(np, "local-mac-address");
if (addr)
return addr;
return of_get_mac_addr(np, "address");
}
EXPORT_SYMBOL(of_get_mac_address);
/**
* Obtain the MAC address from an nvmem provider named 'mac-address' through
* device tree.
* On success, copies the new address into memory pointed to by addr and
* returns 0. Returns a negative error code otherwise.
* @np: Device tree node containing the nvmem-cells phandle
* @addr: Pointer to receive the MAC address using ether_addr_copy()
*/
int of_get_nvmem_mac_address(struct device_node *np, void *addr)
{
struct nvmem_cell *cell;
const void *mac;
size_t len;
int ret;
cell = of_nvmem_cell_get(np, "mac-address");
if (IS_ERR(cell))
return PTR_ERR(cell);
mac = nvmem_cell_read(cell, &len);
nvmem_cell_put(cell);
if (IS_ERR(mac))
return PTR_ERR(mac);
if (len < ETH_ALEN || !is_valid_ether_addr(mac)) {
ret = -EINVAL;
} else {
ether_addr_copy(addr, mac);
ret = 0;
}
kfree(mac);
return ret;
}
EXPORT_SYMBOL(of_get_nvmem_mac_address);
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