Re: [PATCH V5 2/4] dt-bindings: hwmon: ina3221: Add ti,summation-disable

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On Fri, Sep 29, 2023 at 11:36:48AM +0100, Jon Hunter wrote:
> The INA3221 has a critical alert pin that can be controlled by the
> summation control function. This function adds the single
> shunt-voltage conversions for the desired channels in order to
> compare the combined sum to the programmed limit. The Shunt-Voltage
> Sum Limit register contains the programmed value that is compared
> to the value in the Shunt-Voltage Sum register in order to
> determine if the total summed limit is exceeded. If the
> shunt-voltage sum limit value is exceeded, the critical alert pin
> pulls low.
> For the summation limit to have a meaningful value, it is necessary
> to use the same shunt-resistor value on all included channels. Add a new
> vendor specific property, 'ti,summation-disable', to allow specific
> channels to be excluded from the summation control function if the shunt
> resistor is different to other channels or the channel should not be
> considered for triggering the critical alert pin.
> Note that the ina3221 has always supported summing the various input
> channels and summation is enabled by default if the shunt-resistor
> values are the same. This change simply provides a way to exclude
> inputs from the summation. If this property is not populated, then the
> functionality of the driver does not change.
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Signed-off-by: Ninad Malwade <nmalwade@xxxxxxxxxx>
> Reviewed-by: Rob Herring <robh@xxxxxxxxxx>



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