Commit 3fc1cf5f authored Sep 25, 2014 by Joe Schultz Committed by Brian Norris Jan 09, 2015

mtd: physmap_of: Add read-only fallback



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>

parent 106effbe

drivers/mtd/maps/physmap_of.c

+10 −0

Original line number	Original line	Diff line number	Diff line
	@@ -269,6 +269,16 @@ static int of_flash_probe(struct platform_device *dev)
	info->list[i].mtd = obsolete_probe(dev,		info->list[i].mtd = obsolete_probe(dev,
	&info->list[i].map);		&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;		mtd_list[i] = info->list[i].mtd;

	err = -ENXIO;		err = -ENXIO;