linux-kernel - Re: [PATCH 4/8] block: implement NVMEM provider

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Date: Thu, 21 Mar 2024 12:44:19 -0700
From: Bart Van Assche <bvanassche@....org>
To: Daniel Golle <daniel@...rotopia.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
 Jens Axboe <axboe@...nel.dk>, Dave Chinner <dchinner@...hat.com>,
 Jan Kara <jack@...e.cz>, Thomas Weißschuh
 <linux@...ssschuh.net>, Damien Le Moal <dlemoal@...nel.org>,
 Li Lingfeng <lilingfeng3@...wei.com>, Christian Brauner
 <brauner@...nel.org>, Christian Heusel <christian@...sel.eu>,
 Min Li <min15.li@...sung.com>, Adrian Hunter <adrian.hunter@...el.com>,
 Avri Altman <avri.altman@....com>, Hannes Reinecke <hare@...e.de>,
 Christian Loehle <CLoehle@...erstone.com>, Bean Huo <beanhuo@...ron.com>,
 Yeqi Fu <asuk4.q@...il.com>, Victor Shih <victor.shih@...esyslogic.com.tw>,
 Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Dominique Martinet <dominique.martinet@...ark-techno.com>,
 "Ricardo B. Marliere" <ricardo@...liere.net>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
 linux-block@...r.kernel.org
Subject: Re: [PATCH 4/8] block: implement NVMEM provider

On 3/21/24 12:34, Daniel Golle wrote:
> On embedded devices using an eMMC it is common that one or more partitions
> on the eMMC are used to store MAC addresses and Wi-Fi calibration EEPROM
> data. Allow referencing the partition in device tree for the kernel and
> Wi-Fi drivers accessing it via the NVMEM layer.

Why to store calibration data in a partition instead of in a file on a
filesystem?

> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8c88f362feb55..242a0a139c00a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3662,6 +3662,11 @@ L:	linux-mtd@...ts.infradead.org
>   S:	Maintained
>   F:	drivers/mtd/devices/block2mtd.c
>   
> +BLOCK NVMEM DRIVER
> +M:	Daniel Golle <daniel@...rotopia.org>
> +S:	Maintained
> +F:	block/blk-nvmem.c

Why to add this functionality to the block layer instead of somewhere
in the drivers/ directory?

Thanks,

Bart.