summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand
diff options
context:
space:
mode:
authorSekhar Nori <nsekhar@ti.com>2017-03-30 20:09:30 +0530
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-04-25 14:18:41 +0200
commit65a2c1caa70f71690dcb5afd8fc6afe67fcde599 (patch)
tree7bbd3bbdbb6a6bd22063fcd3aa6514f4ba7ddb8f /drivers/mtd/nand
parent2d283ede59869159f4bb84ae689258c5caffce54 (diff)
mtd: nand: davinci: add comment on NAND subpage write status on keystone
Add a comment clarifying that NAND subpage write on keystone works, but is not being enabled in the interest of backward compatibility. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd/nand')
-rw-r--r--drivers/mtd/nand/davinci_nand.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 27fa8b87cd5f..531c51991e57 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -581,6 +581,17 @@ static struct davinci_nand_pdata
"ti,davinci-nand-use-bbt"))
pdata->bbt_options = NAND_BBT_USE_FLASH;
+ /*
+ * Since kernel v4.8, this driver has been fixed to enable
+ * use of 4-bit hardware ECC with subpages and verified on
+ * TI's keystone EVMs (K2L, K2HK and K2E).
+ * However, in the interest of not breaking systems using
+ * existing UBI partitions, sub-page writes are not being
+ * (re)enabled. If you want to use subpage writes on Keystone
+ * platforms (i.e. do not have any existing UBI partitions),
+ * then use "ti,davinci-nand" as the compatible in your
+ * device-tree file.
+ */
if (of_device_is_compatible(pdev->dev.of_node,
"ti,keystone-nand")) {
pdata->options |= NAND_NO_SUBPAGE_WRITE;