Re: [PATCH v10 6/6] mtd: spi-nor: add support for Macronix Octal flash

From: Tudor Ambarus
Date: Wed Oct 02 2024 - 03:45:26 EST




On 26.09.2024 17:19, AlvinZhou wrote:
> From: AlvinZhou <alvinzhou@xxxxxxxxxxx>
>
> Adding manufacturer ID 0xC2 at the end of ID table
> to allow manufacturer fixup to be applied for any
> Macronix flashes instead of needing to list each
> flash ID in the ID table.
>
> Such as macronix_nor_set_octal_dtr function in the
> manufacturer fixup can be applied to any Macronix
> Octal Flashes without the need to add the specific
> ID in the ID table.
>
> Suggested-by: Michael Walle <mwalle@xxxxxxxxxx>
> Signed-off-by: JaimeLiao <jaimeliao@xxxxxxxxxxx>
> Signed-off-by: AlvinZhou <alvinzhou@xxxxxxxxxxx>
> ---
> drivers/mtd/spi-nor/macronix.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/spi-nor/macronix.c b/drivers/mtd/spi-nor/macronix.c
> index f039819a5252..1a8ccebdfe0e 100644
> --- a/drivers/mtd/spi-nor/macronix.c
> +++ b/drivers/mtd/spi-nor/macronix.c
> @@ -200,7 +200,9 @@ static const struct flash_info macronix_nor_parts[] = {
> .name = "mx25l3255e",
> .size = SZ_4M,
> .no_sfdp_flags = SECT_4K,
> - }
> + },
> + /* Need the manufacturer fixups, Keep this last */

you have a capital letter in the middle of the sentence.

I'll replace the comment with:

/*

* This spares us of adding new flash entries for flashes that can be
* initialized solely based on the SFDP data, but still need the
* manufacturer hooks to set parameters that can't be discovered at SFDP
* parsing time.
*/

Which brings me to why you really set this. I remember SFDP contains
tables with sequence of commands for enabling/disabling Octal DTR mode.
Would you please remember me, why you didn't use those SFDP tables and
implemented your own enable/disable methods?

> + { .id = SNOR_ID(0xc2) }
> };
>
> static int macronix_nor_octal_dtr_en(struct spi_nor *nor)