mtd: nand: minor davinci_nand cleanup

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: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/davinci_nand.c

@@ -306,6 +306,10 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
 	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(struct platform_device *pdev)
 	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(struct platform_device *pdev)
 	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(struct platform_device *pdev)
 	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)
+	/* Use board-specific ECC config */
 	ecc_mode		= pdata->ecc_mode;
-	else
-		ecc_mode = NAND_ECC_HW;
 
 	switch (ecc_mode) {
 	case NAND_ECC_NONE:
@@ -469,7 +464,7 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
 			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(struct platform_device *pdev)
 				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);
 	}