Re: GSoC Proposal 2022

["Nuno Sá" <noname.nuno@gmail.com>]

On Tue, 2022-04-12 at 11:48 +0300, Andy Shevchenko wrote:
> On Tue, Apr 12, 2022 at 10:43 AM Maíra Canal <maira.canal@usp.br>
> wrote:
> > On 04/11, Jonathan Cameron wrote:
> 
> ...
> 
> > I took another look at the Analog Devices Inc. catalog and choose
> > another
> > couple of options:
> > 
> >     - ADPD188BI and ADPD410x: are optical devices based on SPI/I2C.
> > I guess they
> >     might be too bold for a GSoC project.
> >     - MAX31875: is a Temperature Sensor based on I2C. Different
> > than the optical
> >     devices, this one might be too simple.
> 
> >     - LTC2499: is a multiplexed ADC sensor. For now, it is my best
> > option.
> 
> Have you checked if it has similarities to 2496 and 2497 variants? We
> already have drivers for those, it makes sense to double check.
> 

Yeah, after a quick look on the datasheet, they look very similar...

The MAX31875 looks to be a fairly simple one (maybe a good candidate
for a first driver) but, IMO, having it in IIO boils down to have
support for continuos mode which would mean triggered buffer support.

And this brings me to something that already crossed my mind...
Jonathan, would it make sense to be able to change the trigger
"sampling frequency" depending on some device configuration? In this
case, if we want to have continous mode, I guess a hrtimer trigger
would be, for example, one good candidate of a trigger to attach.
And, as we can have different SPS, we would want to have the trigger
fireing depending on that... This could also be an additional "task"
for you (if it makes sense of course).

All the above said, if we do not support continuous mode, this device
also falls nicely in the hwmon domain (with all the hyst and over
temperature stuff).

The ADPD188BI looks to be more complicated which might be too much for
GSOC? Not sure here... That said, it looks like you can have some fun
with it.

- Nuno Sá