mtd: add ecc_strength fields to mtd structs

This adds 'ecc_strength' to struct mtd_info.  This stores the maximum number of
bit errors that can be corrected in one writesize region.

For consistency with the nand code, 'strength' is similiarly added to struct
nand_ecc_ctrl.  This stores the maximum number of bit errors that can be
corrected in one ecc step.
Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

include/linux/mtd/mtd.h

@@ -164,6 +164,9 @@ struct mtd_info {
 	/* ECC layout structure pointer - read only! */
 	struct nand_ecclayout *ecclayout;
 
+	/* max number of correctible bit errors per writesize */
+	unsigned int ecc_strength;
+
 	/* Data for variable erase regions. If numeraseregions is zero,
 	 * it means that the whole device has erasesize as given above.
 	 */

include/linux/mtd/nand.h

@@ -324,6 +324,7 @@ struct nand_hw_control {
  * @steps:	number of ECC steps per page
  * @size:	data bytes per ECC step
  * @bytes:	ECC bytes per step
+ * @strength:	max number of correctible bits per ECC step
  * @total:	total number of ECC bytes per page
  * @prepad:	padding information for syndrome based ECC generators
  * @postpad:	padding information for syndrome based ECC generators
@@ -351,6 +352,7 @@ struct nand_ecc_ctrl {
 	int size;
 	int bytes;
 	int total;
+	int strength;
 	int prepad;
 	int postpad;
 	struct nand_ecclayout	*layout;