linux-kernel - Re: [PATCH 3/6] dt-bindings: serdev: ngsm: Add binding for GNSS child node

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Date:   Wed, 27 May 2020 13:28:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Lee Jones <lee.jones@...aro.org>, Jiri Slaby <jslaby@...e.cz>,
        Merlijn Wajer <merlijn@...zup.org>,
        Pavel Machek <pavel@....cz>,
        Peter Hurley <peter@...leysoftware.com>,
        Sebastian Reichel <sre@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 3/6] dt-bindings: serdev: ngsm: Add binding for GNSS
 child node

On Tue, May 12, 2020 at 02:47:10PM -0700, Tony Lindgren wrote:
> For motorola modem case, we may have a GNSS device on channel 4.
> Let's add that to the binding and example.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  .../devicetree/bindings/serdev/serdev-ngsm.yaml          | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml b/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml
> --- a/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml
> +++ b/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml
> @@ -42,6 +42,10 @@ allOf:
>            description: Name of the USB PHY
>            const: usb
>  
> +        compatible:
> +          description: GNSS receiver
> +          const: motorola,mapphone-mdm6600-gnss

I'm not sure how this isn't failing on the example because it is wrong.

You're saying this compatible belongs at the same level as 
phys/phy-names, but that would be the parent which already has a 
compatible. You have to define a child node property (gnss@4) and have 
'compatible' under it. At that point, this schema becomes very much 
Motorola specific.

> +
>        required:
>          - phys
>          - phy-names
> @@ -61,4 +65,9 @@ examples:
>        phy-names = "usb";
>        #address-cells = <1>;
>        #size-cells = <0>;
> +
> +      gnss@4 {
> +         compatible = "motorola,mapphone-mdm6600-gnss";
> +         reg = <4>;
> +      };
>      };
> -- 
> 2.26.2