linux-kernel - Re: [PATCH v2 2/2] iio: light: add support for veml3235

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Message-ID: <7323ca4f-2f79-4478-b2b0-2cfc350af7f8@gmail.com>
Date: Mon, 21 Oct 2024 22:21:22 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Rishi Gupta <gupt21@...il.com>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] iio: light: add support for veml3235

On 21/10/2024 20:39, Jonathan Cameron wrote:
> On Sun, 20 Oct 2024 21:12:17 +0200
> Javier Carrasco <javier.carrasco.cruz@...il.com> wrote:
> 
>> The Vishay veml3235 is a low-power ambient light sensor with I2C
>> interface. It provides a minimum detectable intensity of
>> 0.0021 lx/cnt, configurable integration time and gain, and an additional
>> white channel to distinguish between different light sources.
>>
>> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
> Hi Javier,
> 
> I missed one thing on previous review...
> There is no obvious reason this driver needs to provide raw and processed
> values.  Unless I'm missing something, just provide raw and let userspace
> do the maths for us.
> 
> Jonathan
> 
Sure, I will drop that for v3. I added it because this driver took the
veml6030 as a reference, and that driver provides the processed value. I
guess that the veml6030 should have not provided processed values
either, but it's late to remove them after the driver was released.

Now that we are at it, what is the rule (of thumb?) to provide processed
values? Those that can't be obtained from the raw data and simple
operations with the scale/offset/integration time/whatever userspace can
see?

Thank you and best regards,
Javier Carrasco