linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: ad74413r: allow setting sink current for digital input

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Date:   Tue, 7 Mar 2023 09:53:46 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Cosmin Tanislav <cosmin.tanislav@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: ad74413r: allow setting sink
 current for digital input

On 06/03/2023 10:43, Rasmus Villemoes wrote:
> Depending on the actual hardware wired up to a digital input channel,
> it may be necessary to configure the ad74413r to sink a small
> current. For example, in the case of a simple mechanical switch, the
> charge on the external 68 nF capacitor (cf. the data sheet's Figure
> 34) will keep the channel as reading high even after the switch is
> turned off again.
> 
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  .../devicetree/bindings/iio/addac/adi,ad74413r.yaml      | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml b/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
> index 9eb3ecc8bbc8..590ea7936ad7 100644
> --- a/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
> +++ b/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
> @@ -101,6 +101,15 @@ patternProperties:
>            When not configured as a comparator, the GPO will be treated as an
>            output-only GPIO.
>  
> +      drive-strength-microamp:
> +        description: |
> +          For channels configured as digital input, this configures the sink
> +          current.
> +        minimum: 0
> +        maximum: 1800
> +        default: 0
> +        multipleOf: 120

You could add it also to the example, but it's fine:

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof