Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 20 Feb 2019 11:22:34 +0000
From:   Jonathan Cameron <jic23@kernel.org>
To:     Himanshu Jha <himanshujha199640@gmail.com>
Cc:     Mike Looijmans <mike.looijmans@topic.nl>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
        knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net,
        dpfrey@gmail.com, colin.king@canonical.com
Subject: Re: [PATCH] iio/chemical/bme680: Fix SPI read interface
Message-ID: <20190220112234.1e42d810@archlinux>
In-Reply-To: <20190216112722.GA28619@himanshu-Vostro-3559>
References: <1550238475-25698-1-git-send-email-mike.looijmans@topic.nl>
        <20190216112722.GA28619@himanshu-Vostro-3559>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

..

> > Report temperature in millidegrees Celcius instead of degrees.  
> 
> Jonathan, I didn't know about this but is there any rationale to report
> in millidegress ?

Misguided attempt in the early days of IIO to match hwmon units.
Sadly it is now the ABI and hence 'unfixable'. Same odd units
for voltage and current + a few others that date back to those
days.   A big oops.  There are some other non obvious bits and
pieces so should always check the ABI docs which should be near
complete.
 
> 
> I was under the impression that degC is the standard and you would
> always want you Fitbit/Smart watch to report in degC. Ofcourse,
> userspace program can convert millideg -> degC