Re: [PATCH v2 1/3] dt-bindings: iio: dac: Add AD5529R

[Rodrigo Alencar]

On 26/05/08 01:48PM, Jonathan Cameron wrote:
> On Fri, 8 May 2026 13:55:47 +0200
> Janani Sunil <janani.sunil@xxxxxxxxxx> wrote:

...

> > +  Specifications:
> > +  * 16 independent 12-bit or 16-bit DAC channels
> > +  * Independently programmable output ranges: 0V to 5V, 0V to 10V, 0V to 20V,
> > +    0V to 40V, ±5V, ±10V, ±15V, and ±20V
> > +  * The device supports SPI communication with Mode 0 and Mode 3.
> > +  * 4.096V precision reference, 12ppm/°C maximum
> > +  * Built-in function generation: Toggle, Sinusoidal Dither, and Ramp waveforms
> 
> Interesting - so this is a DDS, be it a simple one. +CC Rodrigo who has been
> wrestling with one of those recently.  Rodrigo, can you take a look at this
> driver and see if it fits in the ABI etc you've been hammering out? Thanks!

I am not sure how this is a DDS as it does really generate frequencies, so it does
not seem to act as an oscillator. I'd say the minimum for a DDS is an NCO + DAC.
The function generation seem to act only on the voltage levels. There is the step
size and ramp limits configuration that are similar to a DDS with a digital ramp
generator. I suppose that users have some use cases that are often integrated into
the products so they can do less (and the overall system becomes more efficient).
However, those products end up solving too many problems at once and they get too
complex!

-- 
Kind regards,

Rodrigo Alencar