linux-kernel - Re: [RFC PATCH v2 19/20] nvmem: layouts: rewrite the u-boot-env driver as a NVMEM layout

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Date:   Wed, 21 Sep 2022 12:37:45 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Frank Rowand <frowand.list@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [RFC PATCH v2 19/20] nvmem: layouts: rewrite the u-boot-env
 driver as a NVMEM layout

Hi Michael,

michael@...le.cc wrote on Fri,  2 Sep 2022 00:18:56 +0200:

> Instead of hardcoding the underlying access method mtd_read() and
> duplicating all the error handling, rewrite the driver as a nvmem
> layout which just uses nvmem_device_read() and thus works with any
> NVMEM device.
> 
> But because this is now not a device anymore, the compatible string
> will have to be changed so the device will still be probed:
>   compatible = "u-boot,env";
> to
>   compatible = "u-boot,env", "nvmem-cells";
> 
> "nvmem-cells" will tell the mtd layer to register a nvmem_device().
> "u-boot,env" will tell the NVMEM that it should apply the u-boot
> environment layout to the NVMEM device.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> changes since v1:
>  - none
> 
>  drivers/nvmem/layouts/Kconfig      |   8 ++
>  drivers/nvmem/layouts/Makefile     |   1 +
>  drivers/nvmem/layouts/u-boot-env.c | 144 +++++++++++++++++++
>  drivers/nvmem/u-boot-env.c         | 218 -----------------------------

Nit: IIRC there is a MAINTAINERS entry to update as well.

Thanks,
Miquèl