[patch 11/14] mtd: nand: minor davinci_nand cleanup

[akpm at linux-foundation.org]

From: David Brownell <dbrownell at users.sourceforge.net>

Make the DaVinci NAND driver require platform_data with board-specific
configuration.  We can't actually do any kind of sane job of configuring
it otherwise.

Also fix the comment about picking the "best" ECC mode.

We can't do those any more; that relied on knowing what kind of CPU we're
using (they don't all support 4-bit ECC), and current policy is that
drivers not have cpu_is_*() checks.

Signed-off-by: David Brownell <dbrownell at users.sourceforge.net>
Cc: David Woodhouse <dwmw2 at infradead.org>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
---

 drivers/mtd/nand/davinci_nand.c |   27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff -puN drivers/mtd/nand/davinci_nand.c~mtd-nand-minor-davinci_nand-cleanup drivers/mtd/nand/davinci_nand.c
--- a/drivers/mtd/nand/davinci_nand.c~mtd-nand-minor-davinci_nand-cleanup
+++ a/drivers/mtd/nand/davinci_nand.c
@@ -306,6 +306,10 @@ static int __init nand_davinci_probe(str
 	uint32_t			val;
 	nand_ecc_modes_t		ecc_mode;
 
+	/* insist on board-specific configuration */
+	if (!pdata)
+		return -ENODEV;
+
 	/* which external chipselect will we be managing? */
 	if (pdev->id < 0 || pdev->id > 3)
 		return -ENODEV;
@@ -351,7 +355,7 @@ static int __init nand_davinci_probe(str
 	info->chip.select_chip	= nand_davinci_select_chip;
 
 	/* options such as NAND_USE_FLASH_BBT or 16-bit widths */
-	info->chip.options	= pdata ? pdata->options : 0;
+	info->chip.options	= pdata->options;
 
 	info->ioaddr		= (uint32_t __force) vaddr;
 
@@ -360,14 +364,8 @@ static int __init nand_davinci_probe(str
 	info->mask_chipsel	= pdata->mask_chipsel;
 
 	/* use nandboot-capable ALE/CLE masks by default */
-	if (pdata && pdata->mask_ale)
-		info->mask_ale	= pdata->mask_cle;
-	else
-		info->mask_ale	= MASK_ALE;
-	if (pdata && pdata->mask_cle)
-		info->mask_cle	= pdata->mask_cle;
-	else
-		info->mask_cle	= MASK_CLE;
+	info->mask_ale		= pdata->mask_cle ? : MASK_ALE;
+	info->mask_cle		= pdata->mask_cle ? : MASK_CLE;
 
 	/* Set address of hardware control function */
 	info->chip.cmd_ctrl	= nand_davinci_hwcontrol;
@@ -377,11 +375,8 @@ static int __init nand_davinci_probe(str
 	info->chip.read_buf     = nand_davinci_read_buf;
 	info->chip.write_buf    = nand_davinci_write_buf;
 
-	/* use board-specific ECC config; else, the best available */
-	if (pdata)
-		ecc_mode = pdata->ecc_mode;
-	else
-		ecc_mode = NAND_ECC_HW;
+	/* Use board-specific ECC config */
+	ecc_mode		= pdata->ecc_mode;
 
 	switch (ecc_mode) {
 	case NAND_ECC_NONE:
@@ -469,7 +464,7 @@ static int __init nand_davinci_probe(str
 			info->mtd.name = master_name;
 		}
 
-		if (mtd_parts_nb <= 0 && pdata) {
+		if (mtd_parts_nb <= 0) {
 			mtd_parts = pdata->parts;
 			mtd_parts_nb = pdata->nr_parts;
 		}
@@ -482,7 +477,7 @@ static int __init nand_davinci_probe(str
 				info->partitioned = true;
 		}
 
-	} else if (pdata && pdata->nr_parts) {
+	} else if (pdata->nr_parts) {
 		dev_warn(&pdev->dev, "ignoring %d default partitions on %s\n",
 				pdata->nr_parts, info->mtd.name);
 	}
_