linux-kernel - Re: [PATCH v5 3/3] dt-bindings: cros-ec: Add ChromeOS fingerprint binding

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Message-ID: <20220519194821.GA2071376-robh@kernel.org>
Date:   Thu, 19 May 2022 14:48:21 -0500
From:   Rob Herring <robh@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        chrome-platform@...ts.linux.dev,
        Guenter Roeck <groeck@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Craig Hesling <hesling@...omium.org>,
        Tom Hughes <tomhughes@...omium.org>,
        Alexandru M Stan <amstan@...omium.org>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v5 3/3] dt-bindings: cros-ec: Add ChromeOS fingerprint
 binding

On Wed, May 18, 2022 at 12:56:17PM -0700, Stephen Boyd wrote:
> Quoting Rob Herring (2022-05-18 09:13:48)
> > On Mon, May 16, 2022 at 12:23:03PM -0700, Stephen Boyd wrote:
> > > Quoting Rob Herring (2022-05-16 08:20:03)
> > > > On Wed, May 11, 2022 at 06:39:21PM -0700, Stephen Boyd wrote:
> > > > > diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> > > > > index 409ecef967ce..e5fe60beb9fe 100644
> > > > > --- a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> > > > > +++ b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> > > > > +      - items:
> > > > > +          - const: google,cros-ec-i2c
> > > > > +      # For implementations of the FPMCU connected through SPI.
> > > > > +      - items:
> > > > > +          - const: google,cros-ec-fp
> > > > > +          - const: google,cros-ec-spi
> > > > > +      # For implementations of the EC is connected through SPI.
> > > > > +      - items:
> > > > > +          - const: google,cros-ec-spi
> > > > > +      # For implementations of the EC is connected through RPMSG.
> > > > > +      - items:
> > > > > +          - const: google,cros-ec-rpmsg
> > > > >
> > > > >    controller-data:
> > > > >      description:
> > > > > @@ -176,6 +189,37 @@ allOf:
> > > > >          - reg
> > > > >          - interrupts
> > > > >
> > > > > +  - if:
> > > > > +      properties:
> > > > > +        compatible:
> > > > > +          contains:
> > > > > +            const: google,cros-ec-fp
> > > > > +    then:
> > > > > +      properties:
> > > > > +        '#address-cells': false
> > > > > +        '#size-cells': false
> > > > > +        typec: false
> > > > > +        ec-pwm: false
> > > > > +        keyboard-controller: false
> > > > > +        proximity: false
> > > > > +        codecs: false
> > > > > +        cbas: false
> > > > > +
> > > > > +      patternProperties:
> > > > > +        "^i2c-tunnel[0-9]*$": false
> > > > > +        "^regulator@[0-9]+$": false
> > > > > +        "^extcon[0-9]*$": false
> > > >
> > > > Is the list of what's allowed shorter? If so, you could list those
> > > > properties and use 'additionalProperties: false'.
> > >
> > > Yes.
> > >
> > > >
> > > > Or maybe this is a sign that this should be a separate schema document.
> > >
> > > I couldn't figure that out. I tried to add new properties here but it
> > > didn't work.
> >
> > Like this?:
> >
> > then:
> >   properties:
> >     allowed-prop-1: true
> >     allowed-prop-2: true
> >     allowed-prop-3: true
> >   additionalProperties: false
> 
> It doesn't seem to combine constraints?
> 
> I get this error:
> 
> 	Documentation/devicetree/bindings/mfd/google,cros-ec.example.dt.yaml:
> 	ec@0: Additional properties are not allowed ('$nodename' was unexpected)

That would be a bug or limitation in the tools. We would need to add 
all the other properties we automatically add as well... I think either 
leaving it as-is or a separate file is going to be the better route 
here.

Rob