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

[Stan, Liviu]

On Fri, 8 May 2026 Jonathan Cameron wrote:
> > > As for the IIO_TEMP question, the chip's custom sensor table stores
> > > temperature in Kelvin (same as the LTC2984 custom RTD table). For the
> > > leak detector, coverage data is encoded as (P + 273.15) K, so when the
> > > chip converts Kelvin to Celsius on output, after the driver applies the
> > > 1000/1024 scale, the IIO output is P * 1000 millidegrees C - 0% reads
> > > as ~0 millidegrees, 100% reads as ~100000 millidegrees. But yes, the
> > > actual useable quantity is coverage percentage, not temperature. Is there
> > > a more suitable existing IIO channel type for coverage percentage?
> > >
> >
> > 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.

Thanks,
Liviu