linux-kernel - Re: [PATCH] dt-bindings: iio: sx9310: Add various settings as DT properties

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Date:   Fri, 25 Sep 2020 13:47:29 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        Daniel Campello <campello@...omium.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Evan Green <evgreen@...omium.org>
Subject: Re: [PATCH] dt-bindings: iio: sx9310: Add various settings as DT
 properties

On Thu, 24 Sep 2020 00:57:13 -0700
Stephen Boyd <swboyd@...omium.org> wrote:

> Quoting Stephen Boyd (2020-09-23 16:25:43)
> > > > > > +
> > > > > > +  semtech,close-debounce-samples:
> > > > > > +    allOf:
> > > > > > +      - $ref: /schemas/types.yaml#definitions/uint32
> > > > > > +      - enum: [0, 2, 4, 8]
> > > > > > +    default: 0
> > > > > > +    description:
> > > > > > +      The number of close samples debounced for proximity/body thresholds.    
> > > > > 
> > > > > This feels like something that has more to do with the object motion than
> > > > > the sensor setup, so perhaps should be controlled from userspace?    
> > > > 
> > > > Sure. Is there an IIO sample property? Or I should make a custom
> > > > knob for this?  
> > > 
> > > It's kind of close to in_proximity0_thresh_period and that may be how they
> > > have implemented it.
> > > 
> > > That control specifies a number of samples for which a condition should be true
> > > before it is reported.  
> > 
> > Sounds good. I can do that. It looks like the driver reports close/far
> > via an event and these debounce values are the same for me so I can
> > write both fields (close and far) with the same thresh_period value from
> > userspace. If they need to be different between the two then this can be
> > reevaluated?
> >   
> 
> Or I can assign thresh_period to falling and rising corresponding to
> close/far debounce. Seems that the direction is the same, but that can
> be split apart and each direction gets a different sysfs file?
Ah I should have read on.  Yes,
thresh_falling_period and thresh_rising_period is fine.

Jonathan