Re: [PATCH v7 1/3] dt-bindings: mtd: spinand: Add randomizer enable/disable properties

[Miquel Raynal <miquel.raynal@bootlin.com>]

On 25/02/2026 at 09:57:03 +08, Cheng Ming Lin <linchengming884@gmail.com> wrote:

> From: Cheng Ming Lin <chengminglin@mxic.com.tw>
>
> Add "nand-randomizer-enable" and "nand-randomizer-disable" boolean
> properties.
>
> These properties allow enabling or disabling the randomizer feature
> via the device tree.
>
> According to JEDEC standard JESD22-A117E, no single data pattern
> represents a universal worst-case for all NAND flash failure mechanisms.
> Different patterns, such as fully programmed, checkerboard, or mostly
> erased, can disproportionately stress specific cells (e.g., programmed,
> erased, or those influenced by adjacent states).
>
> Given that no fixed pattern can cover all scenarios, the use of a
> randomized data pattern is a practical and effective mitigation strategy.
> Our hardware implements a randomizer feature that scrambles user data
> before it is written to the flash and restores the original data upon read.
>
> This ensures the data stored on the media is more evenly distributed,
> thus reducing pattern-dependent degradation. This is especially crucial
> for preventing errors caused by unbalanced data (e.g., all zeros or
> all ones) in blocks with high program/erase (P/E) cycle counts.
> Ultimately, the randomizer improves the long-term reliability and
> endurance of the flash device.
>
> Please refer to the following link for randomizer feature:
> Link:
> https://www.mxic.com.tw/Lists/ApplicationNote/Attachments/2151/AN1051V1-The%20Introduction%20of%20Randomizer%20Feature%20on%20MX30xFxG28AD_MX35xFxG24AD.

This link brings me to a "We have moved to our new home" page.

Anyhow, this Links does not make much sense in the binding. If this is a
very generic AN, why not, but maybe I'd move it to the SPI NAND patches,
as the name implies that it is a bit specific to Macronix chips.

> Signed-off-by: Cheng Ming Lin <chengminglin@mxic.com.tw>

Otherwise both the binding and code look ok from my PoV. So besides the
Link that must be moved and fixed, I'll wait for binding approval.

Thanks,
Miquèl