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

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Date:   Fri, 2 Sep 2022 09:46:16 -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>,
        MTD Maling List <linux-mtd@...ts.infradead.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        netdev <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 Wed, Aug 31, 2022 at 5:30 PM Michael Walle <michael@...le.cc> wrote:
>
> Am 2022-08-31 23:48, schrieb Rob Herring:
> > 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.
>
> I'm not sure I understand what you mean. It has nothing to with
> user and factory provisionings.
>
> SPI flashes have a user programmable and a factory programmable
> area, some have just one of them. Whereas with A/B you (as in the
> user or the board manufacturer) defines an area within a memory device
> to be either slot A or slot B. But here the flash dictates what's
> factory and what's user storage. It's in the datasheet.

Ah, right. Nevermind...

Rob