[U-Boot] [PATCH v9 01/30] mtd: nand: Introduce CONFIG_SYS_NAND_BUSWIDTH_16BIT

[Benoît Thébaudeau]

From: Fabio Estevam <fabio.estevam at freescale.com>

Introduce CONFIG_SYS_NAND_BUSWIDTH_16BIT option so that other NAND controller
drivers could use it when a 16-bit NAND is deployed.

drivers/mtd/nand/ndfc has CONFIG_SYS_NDFC_16BIT, so just rename it, so that
other NAND drivers could reuse the same symbol.

Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau at advansee.com>
---
Changes in v9: None
Changes in v8:
 - New patch.

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 README                  |    9 ++++++---
 drivers/mtd/nand/ndfc.c |    4 ++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/README b/README
index d8cb394..830c45e 100644
--- a/README
+++ b/README
@@ -3713,9 +3713,12 @@ Low Level (hardware related) configuration options:
 - CONFIG_SYS_SRIOn_MEM_SIZE:
 		Size of SRIO port 'n' memory region
 
-- CONFIG_SYS_NDFC_16
-		Defined to tell the NDFC that the NAND chip is using a
-		16 bit bus.
+- CONFIG_SYS_NAND_BUSWIDTH_16BIT
+		Defined to tell the NAND controller that the NAND chip is using
+		a 16 bit bus.
+		Not all NAND drivers use this symbol.
+		Example of driver that uses it:
+		- drivers/mtd/nand/ndfc.c
 
 - CONFIG_SYS_NDFC_EBC0_CFG
 		Sets the EBC0_CFG register for the NDFC. If not defined
diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c
index 6ebbb5e..213d2c9 100644
--- a/drivers/mtd/nand/ndfc.c
+++ b/drivers/mtd/nand/ndfc.c
@@ -156,7 +156,7 @@ static uint8_t ndfc_read_byte(struct mtd_info *mtd)
 
 	struct nand_chip *chip = mtd->priv;
 
-#ifdef CONFIG_SYS_NDFC_16BIT
+#ifdef CONFIG_SYS_NAND_BUSWIDTH_16BIT
 	return (uint8_t) readw(chip->IO_ADDR_R);
 #else
 	return readb(chip->IO_ADDR_R);
@@ -218,7 +218,7 @@ int board_nand_init(struct nand_chip *nand)
 	nand->ecc.bytes = 3;
 	nand->select_chip = ndfc_select_chip;
 
-#ifdef CONFIG_SYS_NDFC_16BIT
+#ifdef CONFIG_SYS_NAND_BUSWIDTH_16BIT
 	nand->options |= NAND_BUSWIDTH_16;
 #endif
 
-- 
1.7.10.4