linux-kernel - Re: [PATCH v4 2/7] dt-bindings: media: max9286: Define 'maxim,gpio-poc'

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Date:   Thu, 15 Apr 2021 11:53:09 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/7] dt-bindings: media: max9286: Define
 'maxim,gpio-poc'

On Thu, Apr 15, 2021 at 02:25:57PM +0200, Jacopo Mondi wrote:
> Define a new vendor property in the maxim,max9286 binding schema.
> 
> The new property allows to declare that the remote camera
> power-over-coax is controlled by one of the MAX9286 gpio lines.
> 
> As it is currently not possible to establish a regulator as consumer
> of the MAX9286 gpio controller for this purpose, the property allows to
> declare that the camera power is controlled by the MAX9286 directly.
> 
> The property accepts a gpio-index (0 or 1) and one line polarity
> flag as defined by dt-bindings/gpio/gpio.h.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  .../bindings/media/i2c/maxim,max9286.yaml     | 71 ++++++++++++++++++-
>  1 file changed, 70 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> index 0e7162998b77..e2422241b7d0 100644
> --- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> @@ -70,6 +70,28 @@ properties:
>        a remote serializer whose high-threshold noise immunity is not enabled
>        is 100000 micro volts
>  
> +  maxim,gpio-poc:
> +    $ref: '/schemas/types.yaml#/definitions/uint32-array'
> +    minItems: 2
> +    maxItems: 2
> +    description: |
> +      Index of the MAX9286 gpio output line (0 or 1) that controls Power over
> +      Coax to the cameras and its associated polarity flag.
> +
> +      The property accepts an array of two unsigned integers, the first being
> +      the gpio line index (0 or 1) and the second being the gpio line polarity
> +      flag (GPIO_ACTIVE_HIGH or GPIO_ACTIVE_LOW) as defined in
> +      <include/dt-bindings/gpio/gpio.h>.
> +
> +      When the remote cameras power is controlled by one of the MAX9286 gpio
> +      lines, this property has to be used to specify which line among the two
> +      available ones controls the remote camera power enablement.
> +
> +      When this property is used it is not possible to register a gpio
> +      controller as the gpio lines are controlled directly by the MAX9286 and
> +      not available for consumers, nor the 'poc-supply' property should be
> +      specified.
> +
>    ports:
>      $ref: /schemas/graph.yaml#/properties/ports
>  
> @@ -182,7 +204,20 @@ required:
>    - reg
>    - ports
>    - i2c-mux
> -  - gpio-controller
> +
> +# If 'maxim,gpio-poc' is present, then 'poc-supply' and 'gpio-controller'
> +# are not allowed.
> +if:
> +  required:
> +    - maxim,gpio-poc
> +then:
> +  allOf:
> +    - not:
> +        required:
> +          - poc-supply
> +    - not:
> +        required:
> +          - gpio-controller

I did tell you to do it this way on irc, but looking at it again, it's 
slightly more concise to do:

     properties:
       poc-supply: false
       gpio-controller: false

Note that 'properties' in the 'if' doesn't work because a schema 
for a property evaluates as true when the property is not present.

Either way,

Reviewed-by: Rob Herring <robh@...nel.org>

Rob