linux-kernel - Re: [PATCH v2 14/34] dt-bindings: arm: Convert Amlogic board/soc bindings to json-schema

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Message-ID: <CAL_Jsq+e2m5VaibpvuTYURZ+E=MCSUGH8cokdWYWEjn_jy9iwA@mail.gmail.com>
Date:   Tue, 4 Dec 2018 08:44:52 -0600
From:   Rob Herring <robh@...nel.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kumar Gala <kumar.gala@...aro.org>,
        ARM-SoC Maintainers <arm@...nel.org>,
        Sean Hudson <darknighte@...knighte.com>,
        Frank Rowand <frowand.list@...il.com>,
        Grant Likely <grant.likely@....com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v2 14/34] dt-bindings: arm: Convert Amlogic board/soc
 bindings to json-schema

On Tue, Dec 4, 2018 at 2:39 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>
> Hi Rob,
>
> You forgot linux-amlogic in CC...
>
> On 03/12/2018 22:32, Rob Herring wrote:
> > Convert Amlogic SoC bindings to DT schema format using json-schema.
> >
> > Cc: Carlo Caione <carlo@...one.org>
> > Cc: Kevin Hilman <khilman@...libre.com>
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: devicetree@...r.kernel.org
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---

[...]

> > +      - items:
> > +          - enum:
> > +              - amlogic,s400
> > +          - const: amlogic,a113d
> > +          - const: amlogic,meson-axg
> > +      - items:
> > +          - enum:
> > +              - amlogic,u200
> > +          - const: amlogic,g12a
>
> but all this feels wrong for me.
>
> First of all, this yaml description is not human friendly and not intuitive at all,
> and secondly with this conversion we loose all the comments about the SoC family relationship
> with the compatible strings !
>
> I really understand the point to have automated verification, but really it's a pain to read
> (I can't imagine newcomers... the actual DT bindings are already hard to read...) and
> I feel it will be a real pain to write !

What do you suggest that would be easier? Is it the YAML itself or the
json-schema vocabulary? For the former, we could use {} and [] to make
things more json style. But I imagine it is the latter.

There is some learning curve for json-schema and is certainly a
concern I have, but there would be a learning curve for anything. Our
choices are use some existing schema language or invent one. All the
previous efforts (there's been about 5 since 2013) have been inventing
one, and they've not gone far. There will be far few resources
available to train people with if we do something custom.

> Can't we mix an "humam text" with a "yaml" part on a same document ? we are in 2018 (nearly 2019),
> and it should be easy to extract a yaml description from a text document without pain and
> keep all the human description, no ?

Yes. Please go look at the annotated example in patch 2.

> What will be the case for all the bindings with ASCII art to describe the architecture of the
> HW ? will you simply drop it to replace it with cold yaml description ?

No, you can have literal blocks and/or comments with however much
description you like. In fact, there's some notion to write the
descriptions in sphinx and extract them to generate documentation, but
that's a ways off. That's just the extent of what is possible.

Rob