linux-kernel - Re: [PATCH v2 1/3] iio: add adddac subdirectory

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Message-ID: <20211030165954.459b978f@jic23-huawei>
Date:   Sat, 30 Oct 2021 16:59:54 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Sa, Nuno" <Nuno.Sa@...log.com>
Cc:     Cosmin Tanislav <demonsingur@...il.com>,
        "Tanislav, Cosmin" <Cosmin.Tanislav@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] iio: add adddac subdirectory

On Fri, 29 Oct 2021 08:00:05 +0000
"Sa, Nuno" <Nuno.Sa@...log.com> wrote:

> Hi,
> 
> > -----Original Message-----
> > From: Cosmin Tanislav <demonsingur@...il.com>
> > Sent: Thursday, October 28, 2021 3:56 PM
> > Cc: demonsingur@...il.com; Tanislav, Cosmin
> > <Cosmin.Tanislav@...log.com>; Lars-Peter Clausen
> > <lars@...afoo.de>; Hennerich, Michael
> > <Michael.Hennerich@...log.com>; Jonathan Cameron
> > <jic23@...nel.org>; Rob Herring <robh+dt@...nel.org>; linux-
> > iio@...r.kernel.org; devicetree@...r.kernel.org; linux-
> > kernel@...r.kernel.org
> > Subject: [PATCH v2 1/3] iio: add adddac subdirectory
> > 
> > [External]
> > 
> > From: Cosmin Tanislav <cosmin.tanislav@...log.com>
> > 
> > For IIO devices that expose both ADC and DAC functionality.
> > 
> > Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
> > ---  
> 
> One thing here that I'm not too sure is the naming of the directory.
> I'm starting to see in ADI more and more of this highly integrated devices... For
> example this one [1], is something we have someone already working one
> and it has ADCs, DAC, amplifiers. So, I'm just wondering if now
> it's not the time where we just have a generic enough place for these kind
> of "combo" devices? Being that said, I have no idea about what name we could
> give :)
> 
> [1]: https://www.analog.com/media/en/technical-documentation/data-sheets/AD7293.pdf
> - Nuno Sá

Naming is always fun. I don't want to have combo start picking up IMUs so
we need to be a bit careful.

We could take the approach we have done with proximity and light sensors of effectively
declaring one type to the dominant one.  There it's a bit clearer though - you don't
buy a proximity sensor if you want to just measure light levels.

Here there isn't always a dominant type.  The example here is titled input / output
device so no preference of one over the other.  The GPIO stuff is kind of a feature
bolted on, so ADDAC is generic enough.

For the ad7293 it does call it a Power Amplifiers 'with' the other stuff so maybe
just sticking to amplifier as the type is the way to go. 

Meh, to a certain extent it doesn't matter - we can safely move these around
once we have more of them in the tree.  The adt7316 is still in staging and
is an ADDAC as well so I think we should put that category in for now.

Jonathan

> 
>