linux-kernel - Re: [PATCH v14 09/11] iio: afe: rescale: add temperature transducers

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Message-ID: <CAHp75Vf+FkofvC3_jvNadGed+eH7mQvVYXTOiWKCzwinJ3-2-w@mail.gmail.com>
Date:   Tue, 8 Feb 2022 15:46:27 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Liam Beguin <liambeguin@...il.com>
Cc:     Peter Rosin <peda@...ntia.se>, Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v14 09/11] iio: afe: rescale: add temperature transducers

On Tue, Feb 8, 2022 at 4:04 AM Liam Beguin <liambeguin@...il.com> wrote:
>
> A temperature transducer is a device that converts a thermal quantity
> into any other physical quantity. This patch adds support for
> temperature to voltage (like the LTC2997) and temperature to current
> (like the AD590) linear transducers.
> In both cases these are assumed to be connected to a voltage ADC.

...

> +       rescale->offset = div_s64((s64)offset * rescale->denominator,
> +                                 rescale->numerator);

Wonder if we can use mult_frac() here. Would it require 64-bit division?

-- 
With Best Regards,
Andy Shevchenko