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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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