[RFC] Spectral ID sensor + floating point questions

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Jonathan et all,

Currently looking at ams AS7262 Spectral ID sensor, and thinking about
adding support to enable a project I'm working on.

But I noticed it is a bit odd in that outputs data for the 6 color
channels in either a) raw 16-bit ADC values b) or calibration adjusted
values (factory calibration) but are presented as 32-bit single
precision floats.

Clearly the latter data is  much more useful but of course it is a
floating point which isn't exactly the ideal in the kernel and there
isn't a precedent in iio (that I know of) for such values.

Datasheet: https://www.mouser.com/ds/2/588/AS7262_DS000486_2-00-1082195.pdf

Any thoughts, or suggestions?

Thanks,

Matt
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