mtd: rawnand: Get rid of chip->bits_per_cell

Now that we inherit from nand_device, we can use
nand_device->memorg.bits_per_cell instead of having our own field at
the nand_chip level.
Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>

drivers/mtd/nand/raw/nand_base.c

@@ -4457,7 +4457,6 @@ void nand_decode_ext_id(struct nand_chip *chip)
 
 	/* The 3rd id byte holds MLC / multichip data */
 	memorg->bits_per_cell = nand_get_bits_per_cell(id_data[2]);
-	chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]);
 	/* The 4th id byte is the important one */
 	extid = id_data[3];
 
@@ -4501,7 +4500,6 @@ static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type)
 
 	/* All legacy ID NAND are small-page, SLC */
 	memorg->bits_per_cell = 1;
-	chip->bits_per_cell = 1;
 }
 
 /*
@@ -4544,7 +4542,6 @@ static bool find_full_id_nand(struct nand_chip *chip,
 		mtd->oobsize = memorg->oobsize;
 
 		memorg->bits_per_cell = nand_get_bits_per_cell(id_data[2]);
-		chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]);
 		chip->chipsize = (uint64_t)type->chipsize << 20;
 		memorg->eraseblocks_per_lun =
 			DIV_ROUND_DOWN_ULL((u64)type->chipsize << 20,
@@ -4584,7 +4581,6 @@ static void nand_manufacturer_detect(struct nand_chip *chip)
 
 		/* The 3rd id byte holds MLC / multichip data */
 		memorg->bits_per_cell = nand_get_bits_per_cell(chip->id.data[2]);
-		chip->bits_per_cell = nand_get_bits_per_cell(chip->id.data[2]);
 		chip->manufacturer.desc->ops->detect(chip);
 	} else {
 		nand_decode_ext_id(chip);

drivers/mtd/nand/raw/nand_hynix.c

@@ -592,7 +592,7 @@ static void hynix_nand_extract_scrambling_requirements(struct nand_chip *chip,
 	u8 nand_tech;
 
 	/* We need scrambling on all TLC NANDs*/
-	if (chip->bits_per_cell > 2)
+	if (nanddev_bits_per_cell(&chip->base) > 2)
 		chip->options |= NAND_NEED_SCRAMBLING;
 
 	/* And on MLC NANDs with sub-3xnm process */

drivers/mtd/nand/raw/nand_jedec.c

@@ -104,7 +104,6 @@ int nand_jedec_detect(struct nand_chip *chip)
 	chip->chipsize = memorg->eraseblocks_per_lun;
 	chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
 	memorg->bits_per_cell = p->bits_per_cell;
-	chip->bits_per_cell = p->bits_per_cell;
 
 	if (le16_to_cpu(p->features) & JEDEC_FEATURE_16_BIT_BUS)
 		chip->options |= NAND_BUSWIDTH_16;

drivers/mtd/nand/raw/nand_micron.c

@@ -385,7 +385,7 @@ static int micron_supports_on_die_ecc(struct nand_chip *chip)
 	if (!chip->parameters.onfi)
 		return MICRON_ON_DIE_UNSUPPORTED;
 
-	if (chip->bits_per_cell != 1)
+	if (nanddev_bits_per_cell(&chip->base) != 1)
 		return MICRON_ON_DIE_UNSUPPORTED;
 
 	/*

drivers/mtd/nand/raw/nand_onfi.c

@@ -249,7 +249,6 @@ int nand_onfi_detect(struct nand_chip *chip)
 	chip->chipsize = memorg->eraseblocks_per_lun;
 	chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
 	memorg->bits_per_cell = p->bits_per_cell;
-	chip->bits_per_cell = p->bits_per_cell;
 
 	if (le16_to_cpu(p->features) & ONFI_FEATURE_16_BIT_BUS)
 		chip->options |= NAND_BUSWIDTH_16;

include/linux/mtd/rawnand.h

@@ -992,7 +992,6 @@ struct nand_legacy {
  * @badblockbits:	[INTERN] minimum number of set bits in a good block's
  *			bad block marker position; i.e., BBM == 11110111b is
  *			not bad when badblockbits == 7
- * @bits_per_cell:	[INTERN] number of bits per cell. i.e., 1 means SLC.
  * @ecc_strength_ds:	[INTERN] ECC correctability from the datasheet.
  *			Minimum amount of bit errors per @ecc_step_ds guaranteed
  *			to be correctable. If unknown, set to zero.
@@ -1064,7 +1063,6 @@ struct nand_chip {
 	} pagecache;
 
 	int subpagesize;
-	uint8_t bits_per_cell;
 	uint16_t ecc_strength_ds;
 	uint16_t ecc_step_ds;
 	int onfi_timing_mode_default;
@@ -1236,9 +1234,9 @@ int nand_create_bbt(struct nand_chip *chip);
  */
 static inline bool nand_is_slc(struct nand_chip *chip)
 {
-	WARN(chip->bits_per_cell == 0,
+	WARN(nanddev_bits_per_cell(&chip->base) == 0,
 	     "chip->bits_per_cell is used uninitialized\n");
-	return chip->bits_per_cell == 1;
+	return nanddev_bits_per_cell(&chip->base) == 1;
 }
 
 /**