linux-kernel - Re: [PATCH] dt-bindings: iio: gyroscope: bosch,bmg160: correct number of pins

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Date:   Sun, 31 Jul 2022 13:30:34 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: iio: gyroscope: bosch,bmg160: correct
 number of pins

On Wed, 27 Jul 2022 16:01:48 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> BMG160 has two interrupt pins to which interrupts can be freely mapped.
> Correct the schema to express such case and fix warnings like:
> 
>   qcom/msm8916-alcatel-idol347.dtb: gyroscope@68: interrupts: [[97, 1], [98, 1]] is too long
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

We may need more than this.  What if only INT2 is wired?  I'd expect such
a device's binding to include interrupt-names to cover that case.
We'd also need a bunch of driver code to route the resulting interrupts.

I think the snag is that adding such support will break existing bindings using the
below.

> ---
>  .../devicetree/bindings/iio/gyroscope/bosch,bmg160.yaml        | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/gyroscope/bosch,bmg160.yaml b/Documentation/devicetree/bindings/iio/gyroscope/bosch,bmg160.yaml
> index b6bbc312a7cf..ebf98bc2eb7f 100644
> --- a/Documentation/devicetree/bindings/iio/gyroscope/bosch,bmg160.yaml
> +++ b/Documentation/devicetree/bindings/iio/gyroscope/bosch,bmg160.yaml
> @@ -24,6 +24,9 @@ properties:
>  
>    interrupts:
>      minItems: 1
> +    items:
> +      - description: INT1 pin
> +      - description: INT2 pin
>      description:
>        Should be configured with type IRQ_TYPE_EDGE_RISING.
>