linux-kernel - Re: [PATCH v4 3/5] iio: adc: mp2629: Add support for mp2629 ADC driver

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Date:   Sat, 28 Mar 2020 14:42:34 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Saravanan Sekar <sravanhome@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Sebastian Reichel <sre@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v4 3/5] iio: adc: mp2629: Add support for mp2629 ADC
 driver

On Mon, 23 Mar 2020 01:32:34 +0200
Andy Shevchenko <andy.shevchenko@...il.com> wrote:

> On Mon, Mar 23, 2020 at 12:47 AM Saravanan Sekar <sravanhome@...il.com> wrote:
> >
> > Add support for 8-bit resolution ADC readings for input power
> > supply and battery charging measurement. Provides voltage, current
> > readings to mp2629 power supply driver.  
> 
> ...
> 
> > +#include <linux/platform_device.h>  
> 
> > +#include <linux/of_device.h>  
> 
> Don't see users of it.
> 
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/regulator/consumer.h>  
> 
> > +#include <linux/sysfs.h>  
> 
> Any users?
> 
> > +#include <linux/regmap.h>  
> 
> Perhaps ordered?
> 
> > +#include <linux/iio/iio.h>
> > +#include <linux/iio/machine.h>
> > +#include <linux/iio/driver.h>  
> 
> + blank line?
> 
> > +#include <linux/mfd/mp2629.h>  
> 
> ...
> 
> > +static int mp2629_read_raw(struct iio_dev *indio_dev,
> > +                       struct iio_chan_spec const *chan,
> > +                       int *val, int *val2, long mask)
> > +{
> > +       struct mp2629_adc *info = iio_priv(indio_dev);
> > +       unsigned int rval;
> > +       int ret;
> > +
> > +       switch (mask) {
> > +       case IIO_CHAN_INFO_RAW:
> > +               ret = regmap_read(info->regmap, chan->address, &rval);
> > +               if (ret < 0)
> > +                       return ret;
> > +
> > +               if (chan->address == MP2629_INPUT_VOLT)  
> 
> > +                       rval &= 0x7f;  
> 
> GENMASK() ?
> 
> > +               *val = rval;
> > +               return IIO_VAL_INT;  
> 
> > +       return 0;
> > +}  
> 
> ...
> 
> > +       void **pdata = pdev->dev.platform_data;  
> 
> Same Qs as per other patch.
> 
> ...
> 
> > +       indio_dev->dev.of_node = pdev->dev.of_node;  
> 
> Jonathan, doesn't IIO core do this for all?
>

Nope.  I'm not totally sure it's always safe to do so
as we have some weird parent structures in some cases.
A quick grep suggests that we may be fine though, or
alternatively be able to get away with a set it if not
already set approach.

I'll take a look when I get some time. It would be nice
to clean this up.

Jonathan