linux-kernel - Re: [PATCH] mtd: expose ooblayout information via sysfs

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Message-ID: <25dcf103-3cd3-400a-b402-cbb5f23006c9@gmail.com>
Date: Wed, 6 Aug 2025 20:40:21 +0200
From: Gabor Juhos <j4g8y7@...il.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Richard Weinberger <richard@....at>, Vignesh Raghavendra
 <vigneshr@...com>, linux-kernel@...r.kernel.org,
 linux-mtd@...ts.infradead.org
Subject: Re: [PATCH] mtd: expose ooblayout information via sysfs

Hi Miquel,

2025. 08. 06. 8:57 keltezéssel, Miquel Raynal írta:
> Hello Gabor,
> 
> On 19/07/2025 at 14:06:48 +02, Gabor Juhos <j4g8y7@...il.com> wrote:
> 
>> Add two new sysfs device attributes which allows to determine the OOB
>> layout used by a given MTD device. This can be useful to verify the
>> current layout during driver development without adding extra debug
>> code. The exposed information also makes it easier to analyze NAND
>> dumps without the need of cravling out the layout from the driver
>> code.
> 
> I would prefer a debugfs entry, as this is mostly focusing on
> development and debugging purposes. sysfs has a stable API, which makes
> it a less relevant place in this case.

Sorry, it seems that I misunderstood the ABI documentation.

Since the 'sysfs-class-mtd' file is under the 'testing' directory within
'Documentation/ABI' I thought that it can be extended by attributes used for
testing purposes. Additionally, the 'oobavail' and 'oobsize' attributes are
exposed via sysfs, so it seemed to be a logical place for the new oob related ones.

Nevertheless, I will check what can I do with the debugfs based approach.

Thanks,
Gabor