linux-kernel - Re: [PATCH v4 1/2] mfd: google,cros-ec: add DT bindings for a baseboard's switch device

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Message-ID: <CAATdQgDWS+D8rudTp_mSB_V=Esnh1MeU9wVywrzOBjVEVpJnfA@mail.gmail.com>
Date:   Wed, 14 Apr 2021 12:15:47 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-input@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Hsin-Yi Wang <hsinyi@...omium.org>,
        Dmitry Torokhov <dtor@...omium.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Lee Jones <lee.jones@...aro.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] mfd: google,cros-ec: add DT bindings for a
 baseboard's switch device

On Tue, Apr 13, 2021 at 10:57 PM Rob Herring <robh@...nel.org> wrote:
>
> On Mon, Apr 12, 2021 at 07:30:19PM +0800, Ikjoon Jang wrote:
> > This is for ChromeOS tablets which have a 'cros_cbas' switch device
> > in the "Whiskers" base board. This device can be instantiated only by
> > device tree on ARM platforms. ChromeOS EC doesn't provide a way to
> > probe the device.
> >
> > Signed-off-by: Ikjoon Jang <ikjn@...omium.org>
> >
> > ---
> >
> > Changes in v4:
> > Define cros-cbase bindings inside google,cros-ec.yaml instead of
> > a seperated binding document.
> >
> >  .../devicetree/bindings/mfd/google,cros-ec.yaml  | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> > index 76bf16ee27ec..c76809cd9f7f 100644
> > --- a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> > +++ b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> > @@ -127,6 +127,18 @@ patternProperties:
> >      type: object
> >      $ref: "/schemas/extcon/extcon-usbc-cros-ec.yaml#"
> >
> > +  "^cbas$":
>
> Not a pattern, put under 'properties'.
>
> > +    type: object
> > +    properties:
> > +      compatible:
> > +        const: google,cros-cbas
>
> Blank line
>
> > +    required:
> > +      - compatible
>
> Blank line
>
> > +    additionalProperties: false
> > +    description:
>
> Make this 1st or at least before 'properties'.

ACKed, thanks!

>
> > +      This device is used to signal when a detachable base is attached
> > +      to a Chrome OS tablet.
>
> This can't happen at runtime?

There is no way to detect the switch device's existence at runtime.
I'll add a note to the description about this.

>
> > +
> >  required:
> >    - compatible
> >
> > @@ -180,6 +192,10 @@ examples:
> >              interrupts = <99 0>;
> >              interrupt-parent = <&gpio7>;
> >              spi-max-frequency = <5000000>;
> > +
> > +            base_detection: cbas {
> > +                compatible = "google,cros-cbas";
> > +            };
> >          };
> >      };
> >
> > --
> > 2.31.1.295.g9ea45b61b8-goog
> >