mtd: rawnand: Add an invalid ECC mode to discriminate with valid ones

NAND ECC modes (or providers) have their own enumeration but, unlike
their algorithms counterpart, there is no invalid or uninitialized
value to discriminate between an error and having chosen a no-ECC
situation. Add an "invalid" entry for this purpose.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200526195633.11543-7-miquel.raynal@bootlin.com

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index d46d34d0d8bef91c638127396e1b0d75f46cf54c..45124dbb183532a398ece7d7252ddd7fd606b58b 100644 (file)
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5022,7 +5022,7 @@ static int of_get_nand_ecc_mode(struct device_node *np)
        if (err < 0)
                return err;
 
-       for (i = 0; i < ARRAY_SIZE(nand_ecc_modes); i++)
+       for (i = NAND_ECC_NONE; i < ARRAY_SIZE(nand_ecc_modes); i++)
                if (!strcasecmp(pm, nand_ecc_modes[i]))
                        return i;
 

diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 605d64ead3a85fbd581605f110d0e57c77ec9685..65b1c1c18b41c6522640d2cff0d08f52ff51f29c 100644 (file)
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -84,6 +84,7 @@ struct nand_chip;
  * Constants for ECC_MODES
  */
 enum nand_ecc_mode {
+       NAND_ECC_INVALID,
        NAND_ECC_NONE,
        NAND_ECC_SOFT,
        NAND_ECC_HW,