Patchwork [U-Boot,v2,1/2] mtd: nand: Introduce CONFIG_SYS_NAND_BUSWIDTH_16BIT

login
register
mail settings
Submitter Fabio Estevam
Date Feb. 26, 2013, 6:35 p.m.
Message ID <1361903720-26935-1-git-send-email-fabio.estevam@freescale.com>
Download mbox | patch
Permalink /patch/223366/
State Superseded
Delegated to: Scott Wood
Headers show

Comments

Fabio Estevam - Feb. 26, 2013, 6:35 p.m.
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@freescale.com>
---
Changes since v1:
- Improve README

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

Patch

diff --git a/README b/README
index d8cb394..bdd2c81 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