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>
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@ -581,6 +581,17 @@ static struct davinci_nand_pdata
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"ti,davinci-nand-use-bbt"))
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pdata->bbt_options = NAND_BBT_USE_FLASH;
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/*
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* Since kernel v4.8, this driver has been fixed to enable
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* use of 4-bit hardware ECC with subpages and verified on
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* TI's keystone EVMs (K2L, K2HK and K2E).
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* However, in the interest of not breaking systems using
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* existing UBI partitions, sub-page writes are not being
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* (re)enabled. If you want to use subpage writes on Keystone
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* platforms (i.e. do not have any existing UBI partitions),
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* then use "ti,davinci-nand" as the compatible in your
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* device-tree file.
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*/
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if (of_device_is_compatible(pdev->dev.of_node,
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"ti,keystone-nand")) {
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pdata->options |= NAND_NO_SUBPAGE_WRITE;
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