powerpc/83xx: Do not configure or probe disabled FSL DR USB controllers

On MPC837X CPUs Dual-Role USB isn't always available (for example DR
USB pins can be muxed away to eSDHC).

U-Boot adds status = "disabled" property into the DR USB nodes to
indicate that we must not try to configure or probe Dual-Role USB,
otherwise we'll break eSDHC support on targets with MPC837X CPUs.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/83xx/usb.c b/arch/powerpc/platforms/83xx/usb.c
index cc99c280aad9..11e1fac17c7f 100644
--- a/arch/powerpc/platforms/83xx/usb.c
+++ b/arch/powerpc/platforms/83xx/usb.c
@@ -14,6 +14,7 @@
 #include <linux/stddef.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
+#include <linux/of.h>
 
 #include <asm/io.h>
 #include <asm/prom.h>
@@ -210,7 +211,7 @@ int mpc837x_usb_cfg(void)
         int ret = 0;
 
         np = of_find_compatible_node(NULL, NULL, "fsl-usb2-dr");
-        if (!np)
+        if (!np || !of_device_is_available(np))
                 return -ENODEV;
         prop = of_get_property(np, "phy_type", NULL);