linux-kernel - Re: [PATCH v6 2/2] dt-bindings: cros-ec: Add ChromeOS fingerprint binding

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Date:   Wed, 15 Jun 2022 17:50:09 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Benson Leung <bleung@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>, patches@...ts.linux.dev,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, chrome-platform@...ts.linux.dev,
        Guenter Roeck <groeck@...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>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v6 2/2] dt-bindings: cros-ec: Add ChromeOS fingerprint binding

Quoting Doug Anderson (2022-06-14 15:41:25)
> On Tue, Jun 14, 2022 at 12:51 PM Stephen Boyd <swboyd@...omium.org> wrote:
> > +
> > +select:
> > +  properties:
> > +    compatible:
> > +      contains:
> > +        const: google,cros-ec-spi
> > +  required:
> > +    - compatible
> > +    - boot0-gpios
>
> I've never personally used "select" before and I'm not sure where it's
> documented. Without knowing anything, it seems weird to me that in
> this file we're matching against a compatible that's not
> google,cros-ec-fp. Randomly grabbing some other example that's similar
> (panel-lvds.yaml) looks more like what I would have expected. AKA in
> this file:
>
> select:
>   properties:
>     compatible:
>       contains:
>         const: google,cros-ec-fp
>   required:
>     - compatible
>
> ...and then in the other file:
>
> select:
>   properties:
>     compatible:
>       contains:
>         const: google,cros-ec-spi
>   not:
>     properties:
>       compatible:
>         contains:
>           const: google,cros-ec-fp
>   required:
>     - compatible
>
>
> Of course, if one of the dt maintainers gives different advice then
> listen to them. ;-)
>

I followed a pwm example, see renesas,tpu-pwm.yaml, but I suspect this
works just as well. I don't really care either way so I'll defer to DT
maintainers here.