linux-kernel - Re: [PATCH 0/8] block: implement NVMEM provider

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Date: Mon, 25 Mar 2024 10:12:59 -0500
From: Rob Herring <robh@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>
Cc: 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 0/8] block: implement NVMEM provider

On Thu, Mar 21, 2024 at 07:31:48PM +0000, Daniel Golle wrote:
> On embedded devices using an eMMC it is common that one or more (hw/sw)
> partitions on the eMMC are used to store MAC addresses and Wi-Fi
> calibration EEPROM data.
> 
> Implement an NVMEM provider backed by a block device as typically the
> NVMEM framework is used to have kernel drivers read and use binary data
> from EEPROMs, efuses, flash memory (MTD), ...
> 
> In order to be able to reference hardware partitions on an eMMC, add code
> to bind each hardware partition to a specific firmware subnode.
> 
> Overall, this enables uniform handling across practially all flash
> storage types used for this purpose (MTD, UBI, and now also MMC).
> 
> As part of this series it was necessary to define a device tree schema
> for block devices and partitions on them, which (similar to how it now
> works also for UBI volumes) can be matched by one or more properties.
> 
> ---
> This series has previously been submitted as RFC on July 19th 2023[1]
> and most of the basic idea did not change since. Another round of RFC
> was submitted on March 5th 2024[2] which has received overall positive
> feedback and only minor corrections have been done since (see
> changelog below).

Also, please version your patches. 'RFC' is a tag, not a version. v1 was
July. v2 was March 5th. This is v3.

Rob