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-rw-r--r--arch/microblaze/kernel/prom_parse.c38
1 files changed, 0 insertions, 38 deletions
diff --git a/arch/microblaze/kernel/prom_parse.c b/arch/microblaze/kernel/prom_parse.c
index 99d9b61cccb5..9ae24f4b882b 100644
--- a/arch/microblaze/kernel/prom_parse.c
+++ b/arch/microblaze/kernel/prom_parse.c
@@ -110,41 +110,3 @@ void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
110 cells = prop ? *(u32 *)prop : of_n_size_cells(dn); 110 cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
111 *size = of_read_number(dma_window, cells); 111 *size = of_read_number(dma_window, cells);
112} 112}
113
114/**
115 * Search the device tree for the best MAC address to use. 'mac-address' is
116 * checked first, because that is supposed to contain to "most recent" MAC
117 * address. If that isn't set, then 'local-mac-address' is checked next,
118 * because that is the default address. If that isn't set, then the obsolete
119 * 'address' is checked, just in case we're using an old device tree.
120 *
121 * Note that the 'address' property is supposed to contain a virtual address of
122 * the register set, but some DTS files have redefined that property to be the
123 * MAC address.
124 *
125 * All-zero MAC addresses are rejected, because those could be properties that
126 * exist in the device tree, but were not set by U-Boot. For example, the
127 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
128 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
129 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
130 * but is all zeros.
131*/
132const void *of_get_mac_address(struct device_node *np)
133{
134 struct property *pp;
135
136 pp = of_find_property(np, "mac-address", NULL);
137 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
138 return pp->value;
139
140 pp = of_find_property(np, "local-mac-address", NULL);
141 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
142 return pp->value;
143
144 pp = of_find_property(np, "address", NULL);
145 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
146 return pp->value;
147
148 return NULL;
149}
150EXPORT_SYMBOL(of_get_mac_address);