linux-kernel - Re: [PATCH v1 1/1] iio: adc: sc27xx_adc: Re-use generic struct u32

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Date:   Mon, 6 Jun 2022 11:12:15 +0800
From:   Cixi Geng <gengcixi@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Cixi Geng <cixi.geng1@...soc.com>, linux-iio@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH v1 1/1] iio: adc: sc27xx_adc: Re-use generic struct u32_fract

Jonathan Cameron <jic23@...nel.org> 于2022年6月4日周六 01:44写道：
>
> On Mon, 30 May 2022 21:09:10 +0300
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
>
> > Instead of custom data type re-use generic struct u32_fract.
>
> There isn't a custom data type  - I'll reword this whilst applying
> if there is no reason for a v2.
>
> > No changes intended.
>
> functional changes
>
> >
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Given they have been active recently I'd ideally like Cixi Geng
> to take a quick glance at this before I apply it.
Acked-by: Cixi Geng <cixi.geng1@...soc.com>
>
> Thanks,
>
> Jonathan
>
> > ---
> >  drivers/iio/adc/sc27xx_adc.c | 15 +++++++--------
> >  1 file changed, 7 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
> > index e9ff2d6a8a57..f8421cbba8fa 100644
> > --- a/drivers/iio/adc/sc27xx_adc.c
> > +++ b/drivers/iio/adc/sc27xx_adc.c
> > @@ -579,15 +579,14 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
> >       return ret;
> >  }
> >
> > -static void sc27xx_adc_volt_ratio(struct sc27xx_adc_data *data,
> > -                               int channel, int scale,
> > -                               u32 *div_numerator, u32 *div_denominator)
> > +static void sc27xx_adc_volt_ratio(struct sc27xx_adc_data *data, int channel, int scale,
> > +                               struct u32_fract *fract)
> >  {
> >       u32 ratio;
> >
> >       ratio = data->var_data->get_ratio(channel, scale);
> > -     *div_numerator = ratio >> SC27XX_RATIO_NUMERATOR_OFFSET;
> > -     *div_denominator = ratio & SC27XX_RATIO_DENOMINATOR_MASK;
> > +     fract->numerator = ratio >> SC27XX_RATIO_NUMERATOR_OFFSET;
> > +     fract->denominator = ratio & SC27XX_RATIO_DENOMINATOR_MASK;
> >  }
> >
> >  static int adc_to_volt(struct sc27xx_adc_linear_graph *graph,
> > @@ -615,7 +614,7 @@ static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
> >  static int sc27xx_adc_convert_volt(struct sc27xx_adc_data *data, int channel,
> >                                  int scale, int raw_adc)
> >  {
> > -     u32 numerator, denominator;
> > +     struct u32_fract fract;
> >       u32 volt;
> >
> >       /*
> > @@ -637,9 +636,9 @@ static int sc27xx_adc_convert_volt(struct sc27xx_adc_data *data, int channel,
> >               break;
> >       }
> >
> > -     sc27xx_adc_volt_ratio(data, channel, scale, &numerator, &denominator);
> > +     sc27xx_adc_volt_ratio(data, channel, scale, &fract);
> >
> > -     return DIV_ROUND_CLOSEST(volt * denominator, numerator);
> > +     return DIV_ROUND_CLOSEST(volt * fract.denominator, fract.numerator);
> >  }
> >
> >  static int sc27xx_adc_read_processed(struct sc27xx_adc_data *data,
>