linux-kernel - Re: [PATCH v1 09/13] iio: chemical: bme680: Move ambient temperature to attributes

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Message-ID: <Zw17n7DB2LdgDct3@vamoirid-laptop>
Date: Mon, 14 Oct 2024 22:14:23 +0200
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, anshulusr@...il.com, gustavograzs@...il.com,
	andriy.shevchenko@...ux.intel.com, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 09/13] iio: chemical: bme680: Move ambient temperature
 to attributes

On Sat, Oct 12, 2024 at 01:01:24PM +0100, Jonathan Cameron wrote:
> On Thu, 10 Oct 2024 23:00:26 +0200
> vamoirid <vassilisamir@...il.com> wrote:
> 
> > From: Vasileios Amoiridis <vassilisamir@...il.com>
> > 
> > Remove the ambient temperature from being a macro and implement it as
> > an attribute. This way, it is possible to dynamically configure the
> > ambient temperature of the environment to improve the accuracy of the
> > measurements.
> > 
> > Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
> New ABI? Would need docs.
> 
> However, I 'think' we have a few cases where we handle this via the slightly
> odd interface of out_temp_processed / _raw with a label saying it's
> ambient temperature.
> 
> The tenuous argument is that we have heaters that actually control the
> temperature and the affect of either heating the thing or just happening
> to know the external temperature ends up being the same. Hence use
> an output channel for this control.
> 
> Jonathan

Hi Jonathan,

Thanks for taking the time to review this. I saw your previous messages,
and I am not responding to all of them so as to not flood you with ACK
messages.

For this one though I have to ask. The last commit of this series is
adding support for an output current channel that controls the current
that is being inserted into an internal plate that is heated up in order
to have more precise acquisition of humidity and gas measurement. Does
it makes sense to add an ambient temp output channel as well?

Cheers,
Vasilis