RE: [PATCH 2/2] iio: temperature: ltc2983: Add support for ADT7604

[Stan, Liviu]

On Fri, May 08, 2026 Nuno Sá wrote:
> > On Fri, 8 May 2026 Jonathan Cameron wrote:
> > > > Will defer this to Jonathan but if we can have a real of the coverage
> > > > given the temperature, I guess this is ok. Given that I think we don't have
> > > > a better channel (unless we add one?) for this. Or just extended_info...
> > > >
> > >
> > > I have no idea what coverage percentage means in this case.
> > > Can you provide some more details or a reference?  Google isn't giving me
> > > anything useful.
> >
> > A leak detector is a sensor like the raindrop detection modules, whose
> > resistance decreases as more of its surface is contacted by liquid. In this case,
> > for example, if half of the sensor's surface is in contact with a liquid, the
> > ADT7604 should, with an appropiate user-provided resistance-vs-coverage
> > table, report 50% coverage in the IIO channel.
> 
> And, AFAIU, depending on the coverage the resistance changes and that's
> how we get into the indirect temperature variations?

If I understand your comment correctly, you're implying that there are indirect
temperature variations caused by resistance changes, and that's what the chip is
measuring? The chip does not measure any actual temperature for this sensor
type, the value in the temperature result register bank is solely a result of the 
chip's interpolation of the user-defined custom table.

Liviu