From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 25 Sep 2014 12:20:08 -0500 (CDT) From: Aaron Sierra To: linux-mtd@lists.infradead.org Message-ID: <2002674283.65675.1411665608272.JavaMail.zimbra@xes-inc.com> In-Reply-To: <103889901.65008.1411665422229.JavaMail.zimbra@xes-inc.com> Subject: [PATCH 1/2] mtd: physmap_of: Add read-only fallback MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Brian Norris , David Woodhouse List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Joe Schultz 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 Signed-off-by: Aaron Sierra --- drivers/mtd/maps/physmap_of.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c index c62e1c3..efbf416 100644 --- a/drivers/mtd/maps/physmap_of.c +++ b/drivers/mtd/maps/physmap_of.c @@ -272,6 +272,16 @@ 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; -- 1.9.1