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powerpc/83xx: don't probe broken PCI on mpc837x_mds boards

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In the standalone setup the board's CPLD disables the PCI internal
arbiter, thus any access to the PCI bus will hang the board.

The common way to disable particular devices in the device tree is to
put the "status" property with any value other than "ok" or "okay"
into the device node we want to disable.

So, when there is no PCI arbiter on the bus the u-boot adds status =
"broken (no arbiter)" property into the PCI controller's node, and so
marks the PCI controller as unavailable.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Anton Vorontsov 2008-10-06 21:08:39 +04:00 committed by Kumar Gala
parent 5c091193e4
commit 62666828ba
1 changed files with 7 additions and 1 deletions
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8
arch/powerpc/platforms/83xx/mpc837x_mds.c
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@ -85,8 +85,14 @@ static void __init mpc837x_mds_setup_arch(void)
ppc_md.progress("mpc837x_mds_setup_arch()", 0);
#ifdef CONFIG_PCI
for_each_compatible_node(np, "pci", "fsl,mpc8349-pci")
for_each_compatible_node(np, "pci", "fsl,mpc8349-pci") {
if (!of_device_is_available(np)) {
pr_warning("%s: disabled by the firmware.\n",
np->full_name);
continue;
}
mpc83xx_add_bridge(np);
}
#endif
mpc837xmds_usb_cfg();
}