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SubjectRe: [RFC PATCH] dt-bindings: add a jsonschema binding example
Hi Grant,

On Mon, Apr 23, 2018 at 4:47 PM, Grant Likely <grant.likely@arm.com> wrote:
> On 21/04/2018 02:28, Rob Herring wrote:
>> On Fri, Apr 20, 2018 at 4:00 PM, Frank Rowand <frowand.list@gmail.com>
>> wrote:
>>>> + interrupts:
>>>> + # Either 1 or 2 interrupts can be present
>>>> + minItems: 1
>>>> + maxItems: 2
>>>> + items:
>>>> + - description: tx or combined interrupt
>>>> + - description: rx interrupt
>>>> +
>>>> + description: |
>>>> + A variable number of interrupts warrants a description of what
>>>> conditions
>>>> + affect the number of interrupts. Otherwise, descriptions on
>>>> standard
>>>> + properties are not necessary.
>>>> +
>>>> + interrupt-names:
>>>> + # minItems must be specified here because the default would be 2
>>>> + minItems: 1
>>>
>>> Why the difference between the interrupts property and the
>>> interrupt-names
>>> property (specifying maxItems for interrupt, but not interrupt-names)?
>>
>> I should probably have maxItems here too.
>>
>>> Others have already commented on a desire to have a way to specify that
>>> number of interrupts should match number of interrupt-names.
>>
>> Yeah, but I don't see a way to do that. You could stick the array size
>> constraints in a common definition and have a $ref to that definition
>> from both, but that doesn't really save you too much.
>
>
> There has been discussions in the jsonschema community regarding
> referencing data in the document when applying the schema.
>
> https://github.com/json-schema-org/json-schema-spec/issues/549
>
> However, those discussions are ongoing and have been pushed back to
> after draft-8 (the current release is draft-7). We can instead define
> DT-specific keywords and extend the validator to make it do what we
> want. We need to do something very similar to validate that the length
> of tuples in 'reg', 'interrupts', and '*gpios' match the '#*-cells' values.

Checking that property lengths match the corresponding #*-cells cannot
be done for a schema, but only for the final DTS, as #*-cells is a property
of the target node, right?

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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