linux-kernel - Re: [PATCH v5 4/5] power: supply: Add support for mps mp2629 battery charger

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Date:   Sat, 28 Mar 2020 13:02:17 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Saravanan Sekar <sravanhome@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...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 v5 4/5] power: supply: Add support for mps mp2629 battery charger

On Sat, Mar 28, 2020 at 2:12 AM Saravanan Sekar <sravanhome@...il.com> wrote:
>
> The mp2629 provides switching-mode battery charge management for
> single-cell Li-ion or Li-polymer battery. Driver supports the
> access/control input source and battery charging parameters.

...

> +#include <linux/module.h>
> +#include <linux/of_device.h>

Missed header bits.h.

...

> +       ret = iio_read_channel_processed(charger->iiochan[ch], &chval);

> +       if (ret < 0)

Is it possible to get positive returned value?

> +               return ret;

...

> +       val->intval = (rval * props[fld].step) + props[fld].min;

Too many parentheses.

...

> +       return ((psp == POWER_SUPPLY_PROP_PRECHARGE_CURRENT) ||
> +               (psp == POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT) ||
> +               (psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT) ||
> +               (psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE));

Ditto.

...

> +       return ((psp == POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT) ||
> +               (psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT));

Ditto.

...

> +       return sprintf(buf, "%d mohm\n", rval);

Hmm... For units we usually have separate node, but it is up to
maintainer, I dunno what the common practice is there.

...

> +       int val;
> +       int ret;
> +
> +       ret = kstrtoint(buf, 10, &val);
> +       if (ret)
> +               return ret;
> +

> +       if (val < 0 && val > 140)

What the point to convert negative values in the first place? kstrtouint()

> +               return -ERANGE;

...

> +       struct power_supply_config psy_cfg = {NULL};

{ 0 }

-- 
With Best Regards,
Andy Shevchenko