mtd: physmap_of: Loop through all "reg" tuples for mapping

This patch changes the loop over the "reg" tuples to not exit
directly upon of_address_to_resource() failure but to continue
with the next "reg" tuple instead. This failure could be due to
size = 0, which might be passed via the device-tree.

This is needed for boards, where a "reg" tuple might have size 0
(of_address_to_resource() returns with EINVAL when size = 0).

Example:

Fully equipped board:

	reg = <0 0x00000000 0x00400000
	       0 0x00400000 0x00400000>;

Partially equipped board:

	reg = <0 0x00000000 0x00400000
	       0 0x00400000 0x00000000>;

This could be the case on boards with runtime detection of
multiple NOR flash configurations where the detected flash size
is inserted into the dtb in U-Boot.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index ec4011c3d5f2..9861814aa027 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -267,9 +267,11 @@ static int __devinit of_flash_probe(struct platform_device *dev,
         for (i = 0; i < count; i++) {
                 err = -ENXIO;
                 if (of_address_to_resource(dp, i, &res)) {
-                        dev_err(&dev->dev, "Can't get IO address from device"
-                                " tree\n");
-                        goto err_out;
+                        /*
+                         * Continue with next register tuple if this
+                         * one is not mappable
+                         */
+                        continue;
                 }
 
                 dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n",