linux-kernel - Re: [PATCH v7 7/7] mtd: ubi: provide NVMEM layer over UBI volumes

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Date: Sun, 25 Feb 2024 23:12:54 +0100 (CET)
From: Richard Weinberger <richard@....at>
To: Miquel Raynal <miquel.raynal@...tlin.com>, 
	Daniel Golle <daniel@...rotopia.org>
Cc: Vignesh Raghavendra <vigneshr@...com>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, 
	linux-mtd <linux-mtd@...ts.infradead.org>, 
	devicetree <devicetree@...r.kernel.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 7/7] mtd: ubi: provide NVMEM layer over UBI volumes

----- Ursprüngliche Mail -----
> Von: "Miquel Raynal" <miquel.raynal@...tlin.com>
> An: "Daniel Golle" <daniel@...rotopia.org>
> CC: "richard" <richard@....at>, "Vignesh Raghavendra" <vigneshr@...com>, "Rob Herring" <robh+dt@...nel.org>, "Krzysztof
> Kozlowski" <krzysztof.kozlowski+dt@...aro.org>, "Conor Dooley" <conor+dt@...nel.org>, "linux-mtd"
> <linux-mtd@...ts.infradead.org>, "devicetree" <devicetree@...r.kernel.org>, "linux-kernel"
> <linux-kernel@...r.kernel.org>
> Gesendet: Montag, 19. Februar 2024 12:01:56
> Betreff: Re: [PATCH v7 7/7] mtd: ubi: provide NVMEM layer over UBI volumes

> Hi Daniel,
> 
> daniel@...rotopia.org wrote on Tue, 19 Dec 2023 02:33:48 +0000:
> 
>> In an ideal world we would like UBI to be used where ever possible on a
>> NAND chip. And with UBI support in ARM Trusted Firmware and U-Boot it
>> is possible to achieve an (almost-)all-UBI flash layout. Hence the need
>> for a way to also use UBI volumes to store board-level constants, such
>> as MAC addresses and calibration data of wireless interfaces.
>> 
>> Add UBI volume NVMEM driver module exposing UBI volumes as NVMEM
>> providers. Allow UBI devices to have a "volumes" firmware subnode with
>> volumes which may be compatible with "nvmem-cells".
>> Access to UBI volumes via the NVMEM interface at this point is
>> read-only, and it is slow, opening and closing the UBI volume for each
>> access due to limitations of the NVMEM provider API.
> 
> I don't feel qualified enough to review the other patches, however this
> one looks good to me.

Finally(!), I had enough time to look.
Thanks for addressing all my comments form the previous series.
Patches applied.

I have only one tiny request, can you share the lockdep spalt
you encountered in ubi_notify_add() regarding mtd_table_mutex
and ubi_devices_mutex? The solutions looks okay to me, but
if you have more details that would be great.

Thanks,
//richard