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

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Message-ID: <5e7e0aa4-74b0-4262-8e8b-de86be54f0bc@linaro.org>
Date: Wed, 2 Oct 2024 10:45:08 +0300
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: AlvinZhou <alvinzhou.tw@...il.com>, linux-mtd@...ts.infradead.org,
 linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
 pratyush@...nel.org, mwalle@...nel.org, miquel.raynal@...tlin.com,
 richard@....at, vigneshr@...com, broonie@...nel.org
Cc: chengminglin@...c.com.tw, leoyu@...c.com.tw,
 AlvinZhou <alvinzhou@...c.com.tw>, JaimeLiao <jaimeliao@...c.com.tw>
Subject: Re: [PATCH v10 6/6] mtd: spi-nor: add support for Macronix Octal
 flash



On 26.09.2024 17:19, AlvinZhou wrote:
> From: AlvinZhou <alvinzhou@...c.com.tw>
> 
> 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@...nel.org>
> Signed-off-by: JaimeLiao <jaimeliao@...c.com.tw>
> Signed-off-by: AlvinZhou <alvinzhou@...c.com.tw>
> ---
>  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)