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ibm_newemac: Skip EMACs that are marked unused by the firmware

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Depending on how the 44x processors are wired, some EMAC cells
might not be useable (and not connected to a PHY). However, some
device-trees may choose to still expose them (since their registers
are present in the MMIO space) but with an "unused" property in them.

Signed-off-by: Hugh Blemings <hugh@blemings.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Hugh Blemings 2007-12-05 11:14:30 +11:00 committed by Jeff Garzik
parent bff713b562
commit 3d722562d7
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ibm_newemac/core.c
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@ -2550,6 +2550,10 @@ static int __devinit emac_probe(struct of_device *ofdev,
struct device_node **blist = NULL;
int err, i;
/* Skip unused/unwired EMACS */
if (of_get_property(np, "unused", NULL))
return -ENODEV;
/* Find ourselves in the bootlist if we are there */
for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
if (emac_boot_list[i] == np)