linux-kernel - Re: [RFC PATCH] dt-bindings: add a jsonschema binding example

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Date:   Mon, 23 Apr 2018 09:38:59 -0500
From:   Rob Herring <robh@...nel.org>
To:     Grant Likely <grant.likely@....com>
Cc:     Stephen Boyd <sboyd@...nel.org>, devicetree-spec@...r.kernel.org,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [RFC PATCH] dt-bindings: add a jsonschema binding example

On Mon, Apr 23, 2018 at 9:01 AM, Grant Likely <grant.likely@....com> wrote:
> On 21/04/2018 00:41, Stephen Boyd wrote:
>>
>> Quoting Rob Herring (2018-04-20 11:15:04)
>>>
>>> On Fri, Apr 20, 2018 at 11:47 AM, Stephen Boyd <sboyd@...nel.org> wrote:
>>>>
>>>> Quoting Rob Herring (2018-04-18 15:29:05)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/example-schema.yaml
>>>>> b/Documentation/devicetree/bindings/example-schema.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..fe0a3bd1668e
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/example-schema.yaml
>
> [...]
>>>>>
>>>>> +  interrupts:
>>>>> +    # Either 1 or 2 interrupts can be present
>>>>> +    minItems: 1
>>>>> +    maxItems: 2
>>>>> +    items:
>>>>> +      - description: tx or combined interrupt
>>>>> +      - description: rx interrupt
>>>>> +
>>>>> +    description: |
>>>>
>>>>
>>>> The '|' is needed to make yaml happy?
>>>
>>>
>>> Yes, this is simply how you do literal text blocks in yaml.
>>>
>>> We don't really need for this one really, but for the top-level
>>> 'description' we do. The long term intent is 'description' would be
>>> written in sphinx/rst and can be extracted into the DT spec (for
>>> common bindings). Grant has experimented with that some.
>>
>>
>> Ok. That sounds cool. Then we could embed links to datasheets and SVGs
>> too.
>
>
> I'd like it if we can define the description text blocks to be
> reStructeredText markup. That makes it even easier to integrate with the
> specification documentation.

I think that's going to require thinking about how each binding is
integrated into the spec. We're only talking about common bindings I
presume, but still we have no model defined. For example, with
properties, I'd assume we'd want to generate a table of properties and
we wouldn't want the property descriptions in rST because the
description becomes just a cell in the table. So we need some sort of
template.

Also, how do we validate that description contains valid rST? No point
requiring it until we can validate it.

> [...]
>>>>>
>>>>> +  # Property names starting with '#' must be quoted
>>>>> +  '#interrupt-cells':
>>>>> +    # A simple case where the value must always be '2'.
>>>>> +    # The core schema handles that this must be a single integer.
>>>>> +    const: 2
>>>>> +
>>>>> +  interrupt-controller: {}
>>>>
>>>>
>>>> Does '{}' mean nothing to see here?
>>>
>>>
>>> Yes. It's just an empty schema that's always valid.
>
>
> IIRC, in the current jsonschema draft-6 spec, the following also has the
> same behaviour, which I like slightly better:
>     interrupt-controller: true

They are not exactly the same. '{}' is a schema object and 'true' is
just a boolean. But yes, it can work. We need to drop "type: object"
from meta-schemas/boolean.yaml and it will work.

Rob