Re: iio: adc: anyone working on TI ADS7066?

[Drew Fustini <drew@beagleboard.org>]

On Sat, Mar 20, 2021 at 06:26:24PM +0000, Jonathan Cameron wrote:
> On Fri, 19 Mar 2021 20:52:34 -0700
> Drew Fustini <drew@beagleboard.org> wrote:
> 
> > I have a board with a TI ADS7066 8-channel ADC [1] that I want to get
> > working in Linux.  I see there is already driver support in iio for
> > ADS1015, ADS79xx, ADS8344, ADS868x and ADS124S0x.
> > 
> > Is anyone already working with the ADS7066 or a similar part in that
> > series?
> > 
> > If not, I'll take one of the existing TI drivers as a template for the
> > ADS7066 driver.
> > 
> > Thank you,
> > Drew
> 
> Hi Drew,
> 
> I've not seen anything for this part.
> 
> From a 10 second glance at the data sheet I see it's capable of
> ADC / GPIO on each pin.   If you plan to support that functionality
> at somepoint make sure to define dt bindings and similar to specify
> which channels are enabled and dynamically create the iio_chan_spec
> array to match.  It can be a bit ugly to retrofit later.

Thanks for the feedback.  The GPIO functionality is not used on the
custom hardware that I have, so I am thinking I would only implement
the ADC functionality.  Is that too short sighted?

> Oh. It does daisy chaining as well. That is always fun to support
> though I guess you may well not have it wired up to do that.
> Oversampling as well - though that looks nice and simple for once.

The hardware I have has two ADS7066 wired up in parallel so I don't
think I would be looking at implementing dasiy chain initially.

Is that ok just implement what I am actually using or is the preference
to have a driver implement all the latent functionality before it would
be merged?

Thanks,
Drew