linux-kernel - Re: [PATCH 2/8] dt-bindings: nvmem: add transformation bindings

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Message-ID: <CAL_JsqLm9M2HJWbDnWxdMNiL2W40h2n=F1kj0XWizQUcmVk0+w@mail.gmail.com>
Date:   Wed, 5 Jan 2022 08:20:55 -0600
From:   Rob Herring <robh@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     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>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Frank Rowand <frowand.list@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH 2/8] dt-bindings: nvmem: add transformation bindings

On Wed, Jan 5, 2022 at 2:25 AM Michael Walle <michael@...le.cc> wrote:
>
> Am 2022-01-04 16:03, schrieb Rob Herring:
> > On Tue, Dec 28, 2021 at 03:25:43PM +0100, Michael Walle wrote:
> >> Just add a simple list of the supported devices which need a nvmem
> >> transformations.
> >>
> >> Also, since the compatible string is prepended to the actual nvmem
> >> compatible string, we need to match using "contains" instead of an
> >> exact
> >> match.
> >>
> >> Signed-off-by: Michael Walle <michael@...le.cc>
> >> ---
> >>  .../devicetree/bindings/mtd/mtd.yaml          |  7 +--
> >>  .../bindings/nvmem/nvmem-transformations.yaml | 46
> >> +++++++++++++++++++
> >>  2 files changed, 50 insertions(+), 3 deletions(-)
> >>  create mode 100644
> >> Documentation/devicetree/bindings/nvmem/nvmem-transformations.yaml
> >>
> >> diff --git a/Documentation/devicetree/bindings/mtd/mtd.yaml
> >> b/Documentation/devicetree/bindings/mtd/mtd.yaml
> >> index 376b679cfc70..0291e439b6a6 100644
> >> --- a/Documentation/devicetree/bindings/mtd/mtd.yaml
> >> +++ b/Documentation/devicetree/bindings/mtd/mtd.yaml
> >> @@ -33,9 +33,10 @@ patternProperties:
> >>
> >>      properties:
> >>        compatible:
> >> -        enum:
> >> -          - user-otp
> >> -          - factory-otp
> >> +        contains:
> >> +          enum:
> >> +            - user-otp
> >> +            - factory-otp
> >
> > If the addition is only compatible strings, then I would just add them
> > here. Otherwise this needs to be structured a bit differently. More on
> > that below.
>
> I wanted to avoid having these compatible strings "cluttered" all around
> the various files. Esp. having a specific compatible string in a generic
> mtd.yaml. But if everyone is fine with that, I'll just move it here.
>
> >>
> >>      required:
> >>        - compatible
> >> diff --git
> >> a/Documentation/devicetree/bindings/nvmem/nvmem-transformations.yaml
> >> b/Documentation/devicetree/bindings/nvmem/nvmem-transformations.yaml
> >> new file mode 100644
> >> index 000000000000..8c8d85fd6d27
> >> --- /dev/null
> >> +++
> >> b/Documentation/devicetree/bindings/nvmem/nvmem-transformations.yaml
> >> @@ -0,0 +1,46 @@
> >> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> >> +%YAML 1.2
> >> +---
> >> +$id: http://devicetree.org/schemas/nvmem/nvmem-transformations.yaml#
> >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >> +
> >> +title: NVMEM transformations Device Tree Bindings
> >> +
> >> +maintainers:
> >> +  - Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> >> +
> >> +description: |
> >> +  This is a list NVMEM devices which need transformations.
> >> +
> >> +properties:
> >> +  compatible:
> >> +    oneOf:
> >> +      - items:
> >> +        - enum:
> >> +          - kontron,sl28-vpd
> >> +        - const: user-otp
> >> +      - const: user-otp
> >
> > This will be applied to any node containing 'user-otp'. You need a
> > custom 'select' to avoid that.
>
> Out of curiosity, you mean something like:
>
> select:
>    compatible:
>      contains:
>        enum:
>          - kontron,sl28-vpd

Yes, that's correct.

Rob