Subject: [PATCH v2] powerpc/83xx: don't probe broken PCI on mpc837x_mds boards

From: Anton Vorontsov <[email-masked]>
Date: Fri, 3 Oct 2008 20:08:14 +0400

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

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 <[email-masked]>
---

On Thu, Oct 02, 2008 at 02:48:44PM -0500, Kumar Gala wrote:
> Can you add to the commit message something about using the 'status  
> field in the device tree to determine if the pci controller is  
> available'

Something like this?

Thanks,

 arch/powerpc/platforms/83xx/mpc837x_mds.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/83xx/mpc837x_mds.c b/arch/powerpc/platforms/83xx/mpc837x_mds.c
index be62de2..8bb13c8 100644
--- a/arch/powerpc/platforms/83xx/mpc837x_mds.c
+++ b/arch/powerpc/platforms/83xx/mpc837x_mds.c
@@ -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();
 }
-- 
1.5.6.3