[PATCH] mtd: spinand: gigadevice: Add continuous read support

[Miquel Raynal]

Hello Teng,

On 18/08/2025 at 21:52:27 +08, Teng Wu <gigadevice2025 at gmail.com> wrote:

> GD5F1GM9 supports a high-speed Continuous Read (CR) mode which allows
> the entire memory array to be read out by a single read command
> without re-issuing the 13h “Page Read to Cache” command for every page.
>
> Datasheet summary
> Feature register B0[3] (NR bit)
> 1 = Normal Read (default)
> 0 = Continuous Read (CR)
>
> ECC status register 7Ch
> Normal read: bits [3:0] → ECC status of last page
> Continuous read: bits [7:4] → accumulated max bit-flips over the
> whole sequential read operation.
>
> Datasheet:
> https://github.com/WT-886/DATASHEET/blob/main/GD5F1GM9-v1.0.pdf
>
> Signed-off-by: Teng Wu <gigadevice2025 at gmail.com>
> ---

I am happy to see more defines benefiting from this feature! Would you
mind sharing the result of a speed test?
`flash_speed -c10 -d /dev/mtdx`

Thanks!
Miquèl