linux-kernel - Re: [PATCH 1/2] dt-bindings: memory: convert Marvell MVEBU SDRAM controller to dtschema

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Message-ID: <294664184613324453f34ee581d9c5e97bab4f31.camel@pengutronix.de>
Date:   Tue, 17 Aug 2021 12:58:42 +0200
From:   Jan Lübbe <jlu@...gutronix.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 1/2] dt-bindings: memory: convert Marvell MVEBU SDRAM
 controller to dtschema

On Tue, 2021-08-17 at 12:52 +0200, Krzysztof Kozlowski wrote:
> On 17/08/2021 12:46, Jan Lübbe wrote:
> > On Tue, 2021-08-17 at 11:38 +0200, Krzysztof Kozlowski wrote:
> > > Convert Marvell MVEBU SDRAM controller bindings to DT schema format
> > > using json-schema.
> > > 
> > > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> > > ---
> > >  .../marvell,mvebu-sdram-controller.yaml       | 31 +++++++++++++++++++
> > >  .../mvebu-sdram-controller.txt                | 21 -------------
> > >  2 files changed, 31 insertions(+), 21 deletions(-)
> > >  create mode 100644 Documentation/devicetree/bindings/memory-controllers/marvell,mvebu-sdram-controller.yaml
> > >  delete mode 100644 Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt
> > > 
> > > diff --git a/Documentation/devicetree/bindings/memory-controllers/marvell,mvebu-sdram-controller.yaml b/Documentation/devicetree/bindings/memory-controllers/marvell,mvebu-sdram-controller.yaml
> > > new file mode 100644
> > > index 000000000000..14a6bc8f421f
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/memory-controllers/marvell,mvebu-sdram-controller.yaml
> > > @@ -0,0 +1,31 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/memory-controllers/marvell,mvebu-sdram-controller.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Marvell MVEBU SDRAM controller
> > > +
> > > +maintainers:
> > > +  - Jan Luebbe <jlu@...gutronix.de>
> > > +  - Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: marvell,armada-xp-sdram-controller
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > +  - |
> > > +    memory-controller@...0 {
> > > +        compatible = "marvell,armada-xp-sdram-controller";
> > > +        reg = <0x1400 0x500>;
> > > +    };
> > > diff --git a/Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt b/Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt
> > > deleted file mode 100644
> > > index 89657d1d4cd4..000000000000
> > > --- a/Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt
> > > +++ /dev/null
> > > @@ -1,21 +0,0 @@
> > > -Device Tree bindings for MVEBU SDRAM controllers
> > > -
> > > -The Marvell EBU SoCs all have a SDRAM controller. The SDRAM controller
> > > -differs from one SoC variant to another, but they also share a number
> > > -of commonalities.
> > > -
> > > -For now, this Device Tree binding documentation only documents the
> > > -Armada XP SDRAM controller.
> > 
> > Please keep the description, otherwise it would be confusing why the binding is
> > named marvell,mvebu-sdram-controller.yaml although it (currenly) only applies to
> > the Armada XP.
> > 
> 
> The description does not explain why it only documents Armada XP, so it
> just duplicates what is in "compatible" part of bindings. How is the
> confusion removed by saying "we document currently only Armada XP"? What
> changes?

Then perhaps the binding should be named marvell,armada-xp-sdram-
controller.yaml? It find it unlikely that support for the other SoC's
controllers will be added, given their age.

Jan

> The entire description (with first paragraph) might make it a derivative
> work, so I would need Ack or SoB from author to relicense it (Cc: Thomas
> Petazzoni).
> 
> 
> Best regards,
> Krzysztof
> 

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