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Commit 65a2c1ca authored by Sekhar Nori's avatar Sekhar Nori Committed by Boris Brezillon
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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: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 2d283ede

drivers/mtd/nand/davinci_nand.c

+11 −0
Original line number Diff line number Diff line
@@ -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;