linux-kernel - Re: [PATCH v9 6/6] mtd: spi-nor: add support for Macronix Octal flash

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Message-ID: <368cd6fb-cab1-44ad-af46-651d9323bc19@linaro.org>
Date: Tue, 24 Sep 2024 07:26:22 +0100
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Alvin Zhou <alvinzhou.tw@...il.com>
Cc: 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, chengminglin@...c.com.tw, leoyu@...c.com.tw,
 AlvinZhou <alvinzhou@...c.com.tw>, JaimeLiao <jaimeliao@...c.com.tw>,
 Bough Chen <haibo.chen@....com>
Subject: Re: [PATCH v9 6/6] mtd: spi-nor: add support for Macronix Octal flash



On 9/24/24 4:25 AM, Alvin Zhou wrote:
> Hi Tudor,
> 
> Tudor Ambarus <tudor.ambarus@...aro.org> 於 2024年9月23日 週一 下午2:54寫道：
>>
>> Hi, Alvin,
>>
>> I quickly skimmed over the previous 5 patches and they are looking fine.
>>
>> I don't get this patch however.
>>
>> On 7/18/24 4:46 AM, AlvinZhou wrote:
>>> From: AlvinZhou <alvinzhou@...c.com.tw>
>>>
>>> Adding Manufacture ID 0xC2 in last of ID table because of
>>> Octal Flash need manufacturer fixup for enabling/disabling
>>> Octal DTR mode.
>>>
>>> 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 */
>>> +     { .id = SNOR_ID(0xc2) }
>>>  };
>>>
>>
>> Could you please elaborate why you need just the manufacturer id here? I
>> would have expected to see a specific flash entry instead.
> 
> Grateful to Michael for the valuable suggestion. This addition of the
> Macronix manufacturer ID enables the fixup functions such as
> macronix_nor_set_octal_dtr to be executed without the need to
> create separate ID entries for each Octal DTR NOR Flash in the
> flash_info.
> 

Ah, nice. Okay then. I'm going to review the rest of the patches. They
look promising ;).