Re: [PATCH v2 1/2] dt-bindings: mtd: Add YAML schemas for the generic NAND options

[Rob Herring <robh+dt@kernel.org>]

On Wed, Apr 3, 2019 at 2:35 AM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
>
> Hi Rob,
>
> On Tue, Apr 02, 2019 at 08:20:58PM -0500, Rob Herring wrote:
> > > +      nand-ecc-strength:
> > > +        $ref: /schemas/types.yaml#/definitions/uint32
> > > +        minimum: 1
> >
> > While I wished this worked, these 2 have to be under 'allOf'.
> > Unfortunately, this will also silently pass validation in json-schema.
>
> Unfortunately, I'm not sure I fully get how the ref system is supposed
> to work yet. Can you elaborate a bit on why we should put the ref and
> whatever constraint we have in an allOf?

TL;DR is that is how sub-classing or extending schemas works.

I think I read something at one point which explained why it doesn't
work without allOf, but couldn't find it. Certainly, it seems like it
should at first.

> Should we do the same in a separate schema that would reference
> another entire schema (like the second patch does with the first
> one)?

That would just split defining the type from the additional
constraints. I prefer to keep the top-level 'allOf' including classes
of devices.

Rob