123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * OF helpers for network devices.
- *
- * Initially copied out of arch/powerpc/kernel/prom_parse.c
- */
- #include <linux/etherdevice.h>
- #include <linux/kernel.h>
- #include <linux/of_net.h>
- #include <linux/of_platform.h>
- #include <linux/phy.h>
- #include <linux/export.h>
- #include <linux/device.h>
- /**
- * of_get_phy_mode - Get phy mode for given device_node
- * @np: Pointer to the given device_node
- * @interface: Pointer to the result
- *
- * The function gets phy interface string from property 'phy-mode' or
- * 'phy-connection-type'. The index in phy_modes table is set in
- * interface and 0 returned. In case of error interface is set to
- * PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
- */
- int of_get_phy_mode(struct device_node *np, phy_interface_t *interface)
- {
- const char *pm;
- int err, i;
- *interface = PHY_INTERFACE_MODE_NA;
- 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))) {
- *interface = i;
- return 0;
- }
- 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;
- }
- static const void *of_get_mac_addr_nvmem(struct device_node *np)
- {
- int ret;
- const void *mac;
- u8 nvmem_mac[ETH_ALEN];
- struct platform_device *pdev = of_find_device_by_node(np);
- if (!pdev)
- return ERR_PTR(-ENODEV);
- ret = nvmem_get_mac_address(&pdev->dev, &nvmem_mac);
- if (ret) {
- put_device(&pdev->dev);
- return ERR_PTR(ret);
- }
- mac = devm_kmemdup(&pdev->dev, nvmem_mac, ETH_ALEN, GFP_KERNEL);
- put_device(&pdev->dev);
- if (!mac)
- return ERR_PTR(-ENOMEM);
- return mac;
- }
- /**
- * 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. If any
- * of the above isn't set, then try to get MAC address from nvmem cell named
- * 'mac-address'.
- *
- * 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.
- *
- * Return: Will be a valid pointer on success and ERR_PTR in case of error.
- */
- 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;
- addr = of_get_mac_addr(np, "address");
- if (addr)
- return addr;
- addr = of_get_mac_addr(np, "nvmem-mac-address");
- if (addr)
- return addr;
- return of_get_mac_addr_nvmem(np);
- }
- EXPORT_SYMBOL(of_get_mac_address);
|