linux-kernel - Re: [PATCH v2 2/2] iio: potentiometer: Add driver support for AD5110

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Date:   Thu, 12 Aug 2021 22:23:27 +0530
From:   Mugilraj Dhavachelvan <dmugil2000@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>,
        Darius <Darius.Berghe@...log.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Slawomir Stepien <sst@...zta.fm>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] iio: potentiometer: Add driver support for AD5110

On Wed, Aug 11, 2021 at 07:06:43PM +0300, Andy Shevchenko wrote:
> On Wed, Aug 11, 2021 at 11:15 AM Lars-Peter Clausen <lars@...afoo.de> wrote:
> > On 8/10/21 2:49 PM, Andy Shevchenko wrote:
> > >
> > >> +       data->tol = data->cfg->kohms * (val & GENMASK(6, 0)) * 10 / 8;
> > >> +       if (!(val & BIT(7)))
> > >> +               data->tol *= -1;
> > > Shouldn't you simple use corresponding sign_extend*()?
> > The data is encoded a sign-magnitude. sign_extend() works for two's
> > complement numbers.
> 
> Good catch!
> I'm wondering if it's a good idea to have a sign_magnitude_to_int()
> helper or so?
>
So, What should I do now?

> -- 
> With Best Regards,
> Andy Shevchenko