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

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Message-ID: <20240219120156.383a1427@xps-13>
Date: Mon, 19 Feb 2024 12:01:56 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Daniel Golle <daniel@...rotopia.org>
Cc: Richard Weinberger <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@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: 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.

Thanks,
Miquèl