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common: Fix-up MAC addr in dts by fetching env variable serially

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The MAC addresses get fixed in the device tree for "ethernet" nodes
is by using trailing number behind "ethernet" found in "/aliases".
It may not be necessary for the "ethernet" nodes to be sequential.
There can be gaps in between or any node disabled

So provide a support to fetch MAC addr sequentially from env
and apply them to "ethernet" nodes in the order they appear in
device tree only if "ethernet" is not "disabled"

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Prabhakar Kushwaha 2017-11-23 16:51:32 +05:30 committed by Simon Glass
parent 48a346061d
commit 24acb83d8f
2 changed files with 30 additions and 4 deletions
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9
README
View File

@ -1603,6 +1603,15 @@ The following options need to be configured:
See doc/README.link-local for more information.
- MAC address from environment variables
FDT_SEQ_MACADDR_FROM_ENV
Fix-up device tree with MAC addresses fetched sequentially from
environment variables. This config work on assumption that
non-usable ethernet node of device-tree are either not present
or their status has been marked as "disabled".
- CDP Options:
CONFIG_CDP_DEVICE_ID

25
common/fdt_support.c
View File

@ -508,12 +508,16 @@ int fdt_fixup_memory(void *blob, u64 start, u64 size)
void fdt_fixup_ethernet(void *fdt)
{
int i, j, prop;
int i = 0, j, prop;
char *tmp, *end;
char mac[16];
const char *path;
unsigned char mac_addr[ARP_HLEN];
int offset;
#ifdef FDT_SEQ_MACADDR_FROM_ENV
int nodeoff;
const struct fdt_property *fdt_prop;
#endif
if (fdt_path_offset(fdt, "/aliases") < 0)
return;
@ -526,7 +530,7 @@ void fdt_fixup_ethernet(void *fdt)
offset = fdt_first_property_offset(fdt,
fdt_path_offset(fdt, "/aliases"));
/* Select property number 'prop' */
for (i = 0; i < prop; i++)
for (j = 0; j < prop; j++)
offset = fdt_next_property_offset(fdt, offset);
if (offset < 0)
@ -535,11 +539,16 @@ void fdt_fixup_ethernet(void *fdt)
path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
if (!strncmp(name, "ethernet", 8)) {
/* Treat plain "ethernet" same as "ethernet0". */
if (!strcmp(name, "ethernet"))
if (!strcmp(name, "ethernet")
#ifdef FDT_SEQ_MACADDR_FROM_ENV
|| !strcmp(name, "ethernet0")
#endif
)
i = 0;
#ifndef FDT_SEQ_MACADDR_FROM_ENV
else
i = trailing_strtol(name);
#endif
if (i != -1) {
if (i == 0)
strcpy(mac, "ethaddr");
@ -548,6 +557,14 @@ void fdt_fixup_ethernet(void *fdt)
} else {
continue;
}
#ifdef FDT_SEQ_MACADDR_FROM_ENV
nodeoff = fdt_path_offset(fdt, path);
fdt_prop = fdt_get_property(fdt, nodeoff, "status",
NULL);
if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
continue;
i++;
#endif
tmp = env_get(mac);
if (!tmp)
continue;