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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - drivers/of/of_net.c
1 // SPDX-License-Identifier: GPL-2.0-only
3 * OF helpers for network devices.
5 * Initially copied out of arch/powerpc/kernel/prom_parse.c
7 #include <linux/etherdevice.h>
8 #include <linux/kernel.h>
9 #include <linux/of_net.h>
10 #include <linux/of_platform.h>
11 #include <linux/phy.h>
12 #include <linux/export.h>
13 #include <linux/device.h>
14 #include <linux/nvmem-consumer.h>
17 * of_get_phy_mode - Get phy mode for given device_node
18 * @np: Pointer to the given device_node
19 * @interface: Pointer to the result
21 * The function gets phy interface string from property 'phy-mode' or
22 * 'phy-connection-type'. The index in phy_modes table is set in
23 * interface and 0 returned. In case of error interface is set to
24 * PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
26 int of_get_phy_mode(struct device_node
*np
, phy_interface_t
*interface
)
31 *interface
= PHY_INTERFACE_MODE_NA
;
33 err
= of_property_read_string(np
, "phy-mode", &pm
);
35 err
= of_property_read_string(np
, "phy-connection-type", &pm
);
39 for (i
= 0; i
< PHY_INTERFACE_MODE_MAX
; i
++)
40 if (!strcasecmp(pm
, phy_modes(i
))) {
47 EXPORT_SYMBOL_GPL(of_get_phy_mode
);
49 static int of_get_mac_addr(struct device_node
*np
, const char *name
, u8
*addr
)
51 struct property
*pp
= of_find_property(np
, name
, NULL
);
53 if (pp
&& pp
->length
== ETH_ALEN
&& is_valid_ether_addr(pp
->value
)) {
54 memcpy(addr
, pp
->value
, ETH_ALEN
);
60 static int of_get_mac_addr_nvmem(struct device_node
*np
, u8
*addr
)
62 struct platform_device
*pdev
= of_find_device_by_node(np
);
63 struct nvmem_cell
*cell
;
68 /* Try lookup by device first, there might be a nvmem_cell_lookup
69 * associated with a given device.
72 ret
= nvmem_get_mac_address(&pdev
->dev
, addr
);
73 put_device(&pdev
->dev
);
77 cell
= of_nvmem_cell_get(np
, "mac-address");
81 mac
= nvmem_cell_read(cell
, &len
);
87 if (len
!= ETH_ALEN
|| !is_valid_ether_addr(mac
)) {
92 memcpy(addr
, mac
, ETH_ALEN
);
99 * of_get_mac_address()
100 * @np: Caller's Device Node
101 * @addr: Pointer to a six-byte array for the result
103 * Search the device tree for the best MAC address to use. 'mac-address' is
104 * checked first, because that is supposed to contain to "most recent" MAC
105 * address. If that isn't set, then 'local-mac-address' is checked next,
106 * because that is the default address. If that isn't set, then the obsolete
107 * 'address' is checked, just in case we're using an old device tree. If any
108 * of the above isn't set, then try to get MAC address from nvmem cell named
111 * Note that the 'address' property is supposed to contain a virtual address of
112 * the register set, but some DTS files have redefined that property to be the
115 * All-zero MAC addresses are rejected, because those could be properties that
116 * exist in the device tree, but were not set by U-Boot. For example, the
117 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
118 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
119 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
122 * Return: 0 on success and errno in case of error.
124 int of_get_mac_address(struct device_node
*np
, u8
*addr
)
131 ret
= of_get_mac_addr(np
, "mac-address", addr
);
135 ret
= of_get_mac_addr(np
, "local-mac-address", addr
);
139 ret
= of_get_mac_addr(np
, "address", addr
);
143 return of_get_mac_addr_nvmem(np
, addr
);
145 EXPORT_SYMBOL(of_get_mac_address
);