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Date:   Mon, 7 Mar 2022 17:18:13 -0600
From:   Rob Herring <robh@kernel.org>
To:     =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>
Cc:     Tom Rini <trini@konsulko.com>,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Ricardo Salveti <ricardo@foundries.io>,
        Michal Simek <michal.simek@xilinx.com>,
        Jorge Ramirez-Ortiz <jorge@foundries.io>,
        Sean Anderson <seanga2@gmail.com>, devicetree@vger.kernel.org,
        u-boot@lists.denx.de, linux-kernel@vger.kernel.org,
        =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>
Subject: Re: [PATCH V3] dt-bindings: nvmem: add U-Boot environment variables
 binding
Message-ID: <YiaStXmE8nYjBHqF@robh.at.kernel.org>
References: <20220228131250.16943-1-zajec5@gmail.com>
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On Mon, Feb 28, 2022 at 02:12:50PM +0100, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@milecki.pl>
> 
> U-Boot uses environment variables for storing device setup data. It
> usually needs to be accessed by a bootloader, kernel and often
> user-space.
> 
> This binding allows describing environment data located in a raw flash
> partition. It's treated as NVMEM device and can be reused later for
> other storage devices.
> 
> Using DT should be cleaner than hardcoding & duplicating such info in
> multiple places. Bootloader & kernel can share DTS and user-space can
> try reading it too or just have correct data exposed by a kernel.
> 
> A custom "compatible" string allows system to automatically load
> relevant NVMEM driver but phandle can be also used for reading raw
> location.
> 
> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> ---
> V2: Update descriptions to don't make this binding MTD (flash partition)
>     specific. Mention multiple possible storage ways.
> V3: Drop
>     allOf:
>       - $ref: nvmem.yaml#
>     as we don't use anything rom the nvmem.yaml. Thanks Rob.
> ---
>  .../devicetree/bindings/nvmem/u-boot,env.yaml | 62 +++++++++++++++++++
>  MAINTAINERS                                   |  5 ++
>  2 files changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/u-boot,env.yaml

A u-boot maintainer should ack this.

Rob