linux-kernel - Re: [PATCH 16/21] mtd: spinand: winbond: Add support for W35N01JW in single mode

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Message-ID: <87semqpk6i.fsf@bootlin.com>
Date: Wed, 02 Apr 2025 19:06:29 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: Richard Weinberger <richard@....at>,  Vignesh Raghavendra
 <vigneshr@...com>,  Santhosh Kumar K <s-k6@...com>,  Pratyush Yadav
 <pratyush@...nel.org>,  Michael Walle <michael@...le.cc>,  Thomas
 Petazzoni <thomas.petazzoni@...tlin.com>,  Steam Lin <stlin2@...bond.com>,
  linux-mtd@...ts.infradead.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/21] mtd: spinand: winbond: Add support for W35N01JW
 in single mode

On 02/04/2025 at 16:22:41 +01, Tudor Ambarus <tudor.ambarus@...aro.org> wrote:

> On 3/7/25 3:08 PM, Miquel Raynal wrote:
>> Add support for the W35N series by describing the smaller (single die)
>> chip. It has 1b/512B ECC support and its own OOB layout.
>> 
>> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
>> ---
>>  drivers/mtd/nand/spi/winbond.c | 54 ++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 54 insertions(+)
>> 
>> diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
>> index 99b9f333eb3142999d8f73d43537f1ed9789c975..9b0369a077efadac8bd6be632f15b822d42a7227 100644
>> --- a/drivers/mtd/nand/spi/winbond.c
>> +++ b/drivers/mtd/nand/spi/winbond.c
>> @@ -23,6 +23,16 @@
>>   * "X4" in the core is equivalent to "quad output" in the datasheets.
>>   */
>>  
>> +static SPINAND_OP_VARIANTS(read_cache_octal_variants,
>> +		SPINAND_PAGE_READ_FROM_CACHE_FAST_1S_1S_1S_OP(0, 1, NULL, 0),
>> +		SPINAND_PAGE_READ_FROM_CACHE_1S_1S_1S_OP(0, 1, NULL, 0));
>
> strange to see octal variants name, but just single SPI ops defined. I
> see you define octal in the next two patches.

Octal is what supports the chip, even though at this stage it is not
pictured. I could rename the variant somewhere later, but I don't like
that as it makes git-blames more difficult and the result is the same
anyway.

> How about squashing all 3?

I prefer to keep core changes separated from manufacturer driver changes
when possible. And for the introduction of the features, it felt correct
to introduce a first level of feature, show the performance, and then a
second level, show again the performance improvement. Maybe I can
re-shuffle the patches to sort core vs. manufacturer changes and squash
patches 17-19 and 18-20 though.