[PATCH 1/2] bus: ixp4xx: Add DT bindings for the IXP4xx expansion bus

[Linus Walleij]

On Mon, Jul 19, 2021 at 5:18 PM Rob Herring <robh at kernel.org> wrote:

> > +patternProperties:
> > +  "^.*@[0-7],[0-9a-f]+$":
> > +    description: Devices attached to chip selects are represented as
> > +      subnodes.
> > +    type: object
> > +
> > +    properties:
> > +      intel,ixp4xx-eb-t1:
> > +        description: Address timing, extend address phase with n cycles.
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +        maximum: 3

(...)

> > +    unevaluatedProperties: false
>
> This will cause failures when implemented. The problem is this won't
> allow any other child node properties as this schema and the device
> schema are evaluated independently. The only way I see to solve this is
> the child node schemas have to include some 'bus properties' schema
> which includes all possible bus controller properties. There's been a
> recent patch set doing this for SPI. At least here, I think the number
> of different child devices on parallel expansion buses are limited.
>
> So spliting this to 2 schema files would be the first step. Minimally,
> just drop unevaluatedProperties.

SPI upstream simply uses

additionalProperties: true

is that acceptable for now?

Yours,
Linus Walleij