linux-kernel - Re: [PATCH v3] dt-bindings: iio: afe: voltage-divider: Add io-channel-cells

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Date: Tue, 30 Jan 2024 17:23:12 +0000
From: Conor Dooley <conor@...nel.org>
To: Naresh Solanki <naresh.solanki@...ements.com>
Cc: Peter Rosin <peda@...ntia.se>, Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, mazziesaccount@...il.com,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] dt-bindings: iio: afe: voltage-divider: Add
 io-channel-cells

Hey,

On Tue, Jan 30, 2024 at 05:26:50PM +0530, Naresh Solanki wrote:
> voltage-divider is always an iio consumer at the same time it is
> optionally an iio provider.
> Hence add #io-channel-cells
> Also update example.
> 
> Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
> ---
>  .../bindings/iio/afe/voltage-divider.yaml          | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml b/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
> index dddf97b50549..98fec8548cc3 100644
> --- a/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
> +++ b/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
> @@ -39,6 +39,13 @@ properties:
>      description: |
>        Channel node of a voltage io-channel.
>  
> +  '#io-channel-cells':
> +    description:
> +      In addition to consuming the measurement services of a voltage output
> +      channel the voltage divider can act as a provider of measurement
> +      services to other devices.

Did you miss:
https://lore.kernel.org/all/20240127165542.6eeb23e9@jic23-huawei/
Where I said that I would like to have an example of where this would be
used in the description? Peter gave a good example that you can draw on.

> +    const: 1
> +
>    output-ohms:
>      description:
>        Resistance Rout over which the output voltage is measured. See full-ohms.
> @@ -75,12 +82,17 @@ examples:
>              spi-max-frequency = <1000000>;
>          };
>      };
> -    sysv {
> +    p12v_vd: sysv {
>          compatible = "voltage-divider";
>          io-channels = <&maxadc 1>;
> +        #io-channel-cells = <1>;
>  
>          /* Scale the system voltage by 22/222 to fit the ADC range. */
>          output-ohms = <22>;
>          full-ohms = <222>; /* 200 + 22 */
>      };

Blank line here please.

Thanks,
Conor.

> +    iio-hwmon {
> +        compatible = "iio-hwmon";
> +        io-channels = <&p12v_vd 0>;
> +    };
>  ...
> 
> base-commit: 861c0981648f5b64c86fd028ee622096eb7af05a
> -- 
> 2.42.0
> 

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