[PATCH] [v4] mtd: spi-nor: gigadevice: Add support for GD25LQ256H

[Michael Walle]

On Wed May 27, 2026 at 5:28 AM CEST, Weimin Wu wrote:
> Add support for the GigaDevice GD25LQ256H (JEDEC ID c8 60 19),
> a 256Mbit (32MB) SPI NOR flash chip which supports SFDP.
>
> Without this patch, The WP status cannot be obtained using flashrom:
> device:/ # flashrom --wp-status
> ...
> linux_mtd_wp_read_cfg:
> ioctl: Operation not supported on transport endpoint
> Failed to get WP status: failed to read the current WP configuration
>
> and with this patch:
> device:/ # flashrom --wp-status
> ...
> Protection range: start=0x00000000 length=0x00000000 (none)
> Protection mode: disabled
> SUCCESS
>
> Link: https://download.gigadevice.com/Datasheet/DS-01085-GD25LQ256H-Rev1.3.pdf
>
> Signed-off-by: Weimin Wu <wuweimin at huaqin.corp-partner.google.com>

For reference, this won't fly, as the ID is reused among different
flashes, in particular the GD25LQ255E and the GD25LQ256H, which has
different block protection schemes and one needs SPI_NOR_4BIT_BP
and one doesn't.

-michael
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