linux-kernel - Re: [PATCH v1 08/14] dt-bindings: mtd: relax the nvmem compatible string

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Date:   Wed, 31 Aug 2022 16:48:09 -0500
From:   Rob Herring <robh@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        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>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        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,
        netdev@...r.kernel.org, Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: Re: [PATCH v1 08/14] dt-bindings: mtd: relax the nvmem compatible
 string

On Thu, Aug 25, 2022 at 11:44:17PM +0200, Michael Walle wrote:
> The "user-otp" and "factory-otp" compatible string just depicts a
> generic NVMEM device. But an actual device tree node might as well
> contain a more specific compatible string. Make it possible to add
> more specific binding elsewere and just match part of the compatibles
> here.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  Documentation/devicetree/bindings/mtd/mtd.yaml | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)

In hindsight it looks like we are mixing 2 different purposes of 'which 
instance is this' and 'what is this'. 'compatible' is supposed to be the 
latter.

Maybe there's a better way to handle user/factory? There's a similar 
need with partitions for A/B or factory/update.

Rob