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

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Date:   Mon, 16 May 2022 12:23:03 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rob Herring <robh@...nel.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

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
> > @@ -19,15 +19,19 @@ description:
> >  properties:
> >    compatible:
> >      oneOf:
> > -      - description:
> > -          For implementations of the EC is connected through I2C.
> > -        const: google,cros-ec-i2c
> > -      - description:
> > -          For implementations of the EC is connected through SPI.
> > -        const: google,cros-ec-spi
> > -      - description:
> > -          For implementations of the EC is connected through RPMSG.
> > -        const: google,cros-ec-rpmsg
> > +      # For implementations of the EC is connected through I2C.
>
> Using 'description' was preferred.

I just learned that I should use anyOf instead of oneOf. Confusing!

>
> > +      - 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. And then when I tried to make a different schema document
it complained that the example for google,cros-ec-spi in here had a
problem. Can properties be defined in this section? Or only listed and
then additionalProperties be marked false?