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

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Message-ID: <d6852a20-157b-ea51-7def-f11b5d1c81fe@gmail.com>
Date:   Sun, 29 Mar 2020 12:37:53 +0200
From:   saravanan sekar <sravanhome@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     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

Hi Andy,

On 28/03/20 3:42 pm, Jonathan Cameron wrote:
> 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.
Forgot to reply, its needed since I used struct of_device
"error: field name not in record or union initializer
   { .compatible = "mps,mp2629_charger"},"
>>> +#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
>
>
>
>