Autodetection of NAND device bus-width was added in generic NAND driver as
part of following commit
commit 64b37b2a63eb2f80b65c7185f0013f8ffc637ae3
Author: Matthieu CASTET <matthieu.castet@xxxxxxxxxx>
AuthorDate: 2012-11-06
mtd: nand: add NAND_BUSWIDTH_AUTO to autodetect bus width
This patch enables this feature for OMAP2 NAND driver
Signed-off-by: Pekon Gupta <pekon@xxxxxx>
---
drivers/mtd/nand/omap2.c | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 5596368..57a3f51 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1856,8 +1856,7 @@ static int omap_nand_probe(struct platform_device *pdev)
mtd->name = dev_name(&pdev->dev);
mtd->owner = THIS_MODULE;
nand_chip = &info->nand;
- nand_chip->options = pdata->devsize;
- nand_chip->options |= NAND_SKIP_BBTSCAN;
+ nand_chip->options |= NAND_SKIP_BBTSCAN | NAND_BUSWIDTH_AUTO;
#ifdef CONFIG_MTD_NAND_OMAP_BCH
info->of_node = pdata->of_node;
#endif
@@ -1904,6 +1903,21 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->chip_delay = 50;
}
+ /* scan for NAND device connected to chip controller */
+ if (nand_scan_ident(mtd, 1, NULL)) {
+ err = -ENXIO;
+ goto out_release_mem_region;
+ }
+ if ((nand_chip->options & NAND_BUSWIDTH_16) !=
+ (pdata->devsize & NAND_BUSWIDTH_16)) {
+ pr_err("%s: detected %s device but driver configured for %s\n",
+ DRIVER_NAME,
+ (nand_chip->options & NAND_BUSWIDTH_16) ? "x16" : "x8",
+ (pdata->devsize & NAND_BUSWIDTH_16) ? "x16" : "x8");
+ err = -EINVAL;
+ goto out_release_mem_region;
+ }
+
switch (pdata->xfer_type) {
case NAND_OMAP_PREFETCH_POLLED:
nand_chip->read_buf = omap_read_buf_pref;
@@ -2011,17 +2025,6 @@ static int omap_nand_probe(struct platform_device *pdev)
}
}
- /* DIP switches on some boards change between 8 and 16 bit
- * bus widths for flash. Try the other width if the first try fails.
- */
- if (nand_scan_ident(mtd, 1, NULL)) {
- nand_chip->options ^= NAND_BUSWIDTH_16;
- if (nand_scan_ident(mtd, 1, NULL)) {
- err = -ENXIO;
- goto out_release_mem_region;
- }
- }
-
/* rom code layout */
if (pdata->ecc_opt == OMAP_ECC_HAM1_CODE_HW) {
--
1.8.1
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
