linux-kernel - Re: [PATCH v6 1/3] dt-bindings: mtd: partitions: Add binman compatible

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Message-ID: <CAPnjgZ1uW8T6woXSqFUNm301=W3zBYOrADREkrz=DuwSW87qZg@mail.gmail.com>
Date:   Fri, 8 Dec 2023 15:58:10 -0700
From:   Simon Glass <sjg@...omium.org>
To:     Rob Herring <robh@...nel.org>
Cc:     devicetree@...r.kernel.org,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        linux-mtd@...ts.infradead.org, Tom Rini <trini@...sulko.com>,
        Michael Walle <mwalle@...nel.org>,
        U-Boot Mailing List <u-boot@...ts.denx.de>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Pratyush Yadav <ptyadav@...zon.de>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/3] dt-bindings: mtd: partitions: Add binman compatible

Hi Rob,

On Fri, 8 Dec 2023 at 14:56, Rob Herring <robh@...nel.org> wrote:
>
> On Fri, Dec 8, 2023 at 11:47 AM Simon Glass <sjg@...omium.org> wrote:
> >
> > Hi Rob,
> >
> > On Fri, 8 Dec 2023 at 08:00, Rob Herring <robh@...nel.org> wrote:
> > >
> > > On Thu, Nov 16, 2023 at 10:28:50AM -0700, Simon Glass wrote:
> > > > Add a compatible string for binman, so we can extend fixed-partitions
> > > > in various ways.
> > > >
> > > > Signed-off-by: Simon Glass <sjg@...omium.org>
> > > > ---
> > > >
> > > > (no changes since v5)
> > > >
> > > > Changes in v5:
> > > > - Add #address/size-cells and parternProperties
> > > > - Drop $ref to fixed-partitions.yaml
> > > > - Drop 'select: false'
> > > >
> > > > Changes in v4:
> > > > - Change subject line
> > > >
> > > > Changes in v3:
> > > > - Drop fixed-partition additional compatible string
> > > > - Drop fixed-partitions from the example
> > > > - Mention use of compatible instead of label
> > > >
> > > > Changes in v2:
> > > > - Drop mention of 'enhanced features' in fixed-partitions.yaml
> > > > - Mention Binman input and output properties
> > > > - Use plain partition@xxx for the node name
> > > >
> > > >  .../bindings/mtd/partitions/binman.yaml       | 68 +++++++++++++++++++
> > > >  .../bindings/mtd/partitions/partitions.yaml   |  1 +
> > > >  MAINTAINERS                                   |  5 ++
> > > >  3 files changed, 74 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> > > > new file mode 100644
> > > > index 000000000000..329217550a98
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> > > > @@ -0,0 +1,68 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > > +# Copyright 2023 Google LLC
> > > > +
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/mtd/partitions/binman.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Binman firmware layout
> > > > +
> > > > +maintainers:
> > > > +  - Simon Glass <sjg@...omium.org>
> > > > +
> > > > +description: |
> > > > +  The binman node provides a layout for firmware, used when packaging firmware
> > > > +  from multiple projects. It is based on fixed-partitions, with some
> > > > +  extensions, but uses 'compatible' to indicate the contents of the node, to
> > > > +  avoid perturbing or confusing existing installations which use 'label' for a
> > > > +  particular purpose.
> > > > +
> > > > +  Binman supports properties used as inputs to the firmware-packaging process,
> > > > +  such as those which control alignment of partitions. This binding addresses
> > > > +  these 'input' properties. For example, it is common for the 'reg' property
> > > > +  (an 'output' property) to be set by Binman, based on the alignment requested
> > > > +  in the input.
> > > > +
> > > > +  Once processing is complete, input properties have mostly served their
> > > > +  purpose, at least until the firmware is repacked later, e.g. due to a
> > > > +  firmware update. The 'fixed-partitions' binding should provide enough
> > > > +  information to read the firmware at runtime, including decompression if
> > > > +  needed.
> > >
> > > How is this going to work exactly? binman reads these nodes and then
> > > writes out 'fixed-partitions' nodes. But then you've lost the binman
> > > specifc parts needed for repacking.
> >
> > No, they are the same node. I do want the extra information to stick
> > around. So long as it is compatible with fixed-partition as well, this
> > should work OK.
>
> How can it be both? The partitions node compatible can be either
> 'fixed-partitions' or 'binman'.

Can we not allow it to be both? I have tried to adjust things in
response to feedback but perhaps the feedback was leading me down the
wrong path?

But if not, then whatever works is fine for now. I just want to make
some progress on this very, very old series.

>
> In the partition nodes, 'align' for example is allowed for a binman
> partition but not a fixed-partition.
>
> Note that the schema may not actually warn on extra properties ATM
> because there are some issues with the schema structure. Since there
> can be nested partittions, that complicates matters. It's been on my
> todo list to fix.

OK.

Regards,
Simon