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mtd: physmap_of: Add read-only fallback

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Previously, when probing a CFI chip which was write-protected at the
hardware level, the probe would fail due to the fact it could not put
the chip into QUERY mode. This would result in no MTD devices being
created.

Add a fallback to probe using the map_rom driver if the user-selected
probe fails.

Signed-off-by: Joe Schultz <jschultz@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Joe Schultz 2014-09-25 12:20:08 -05:00 committed by Brian Norris
parent 106effbe18
commit 3fc1cf5f0a
1 changed files with 10 additions and 0 deletions
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10
drivers/mtd/maps/physmap_of.c
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@ -269,6 +269,16 @@ static int of_flash_probe(struct platform_device *dev)
info->list[i].mtd = obsolete_probe(dev,
&info->list[i].map);
}
/* Fall back to mapping region as ROM */
if (!info->list[i].mtd) {
dev_warn(&dev->dev,
"do_map_probe() failed for type %s\n",
probe_type);
info->list[i].mtd = do_map_probe("map_rom",
&info->list[i].map);
}
mtd_list[i] = info->list[i].mtd;
err = -ENXIO;