linux/net/core/of_net.c

// 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/platform_device.h>
#include <linux/phy.h>
#include <linux/export.h>
#include <linux/device.h>
#include <linux/nvmem-consumer.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)
{ … }
EXPORT_SYMBOL_GPL(…);

static int of_get_mac_addr(struct device_node *np, const char *name, u8 *addr)
{ … }

int of_get_mac_address_nvmem(struct device_node *np, u8 *addr)
{ … }
EXPORT_SYMBOL(…);

/**
 * of_get_mac_address()
 * @np:		Caller's Device Node
 * @addr:	Pointer to a six-byte array for the result
 *
 * 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: 0 on success and errno in case of error.
*/
int of_get_mac_address(struct device_node *np, u8 *addr)
{ … }
EXPORT_SYMBOL(…);

/**
 * of_get_ethdev_address()
 * @np:		Caller's Device Node
 * @dev:	Pointer to netdevice which address will be updated
 *
 * Search the device tree for the best MAC address to use.
 * If found set @dev->dev_addr to that address.
 *
 * See documentation of of_get_mac_address() for more information on how
 * the best address is determined.
 *
 * Return: 0 on success and errno in case of error.
 */
int of_get_ethdev_address(struct device_node *np, struct net_device *dev)
{ … }
EXPORT_SYMBOL(…);