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Date: Thu, 15 Feb 2024 15:49:13 -0600
From: David Lechner <dlechner@...libre.com>
To: Rob Herring <robh@...nel.org>
Cc: linux-iio@...r.kernel.org, 
	Michael Hennerich <Michael.Hennerich@...log.com>, Jonathan Cameron <jic23@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Nuno Sá <nuno.sa@...log.com>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: iio: adc: add ad7944 ADCs

On Thu, Feb 15, 2024 at 7:23 AM Rob Herring <robh@...nel.org> wrote:
>
> On Tue, Feb 06, 2024 at 11:34:13AM -0600, David Lechner wrote:
> > On Tue, Feb 6, 2024 at 11:26 AM David Lechner <dlechner@...libre.com> wrote:
> > >
> >
> >      if:
> >        properties:
> >          adi,reference:
> >            const: external
>
>          required:
>            - adi,reference
>
> >      then:
> >        required:
> >          - ref-supply
> >      else:
> >        properties:
> >          ref-supply: false
> >
> > to be sufficient here. However, currently, if the adi,reference
> > property is omitted from the dts/dtb, the condition here evaluates to
> > true and unexpectedly (incorrectly?) the validator requires the
> > ref-supply property.
>
> That's just how json-schema works. With the above, it should work for
> you.
>
> However, redesigning the binding would make things simpler. Just make
> 'ref-supply' being present mean external ref. No 'ref-supply' is then
> internal. Then you just need a boolean for 'internal-buffer' mode and:
>
> dependentSchemas:
>   ref-supply:
>     not:
>       required: ['adi,internal-buffer-ref']
>

Per Jonathan's suggestion, I plan to simplify the bindings like this
but just use the presence/absence of refin-supply as this boolean
value to simplify it even further.

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