linux-kernel - Re: [PATCH v8 4/6] power: supply: Add support for mps mp2629 battery charger

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Message-ID: <20200413204847.ni7dsrn5tslrorqn@earth.universe>
Date:   Mon, 13 Apr 2020 22:48:47 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     saravanan sekar <sravanhome@...il.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        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>,
        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 v8 4/6] power: supply: Add support for mps mp2629 battery
 charger

Hi,

On Mon, Apr 13, 2020 at 10:28:19PM +0200, saravanan sekar wrote:
> Hi Andy,
> 
> On 13/04/20 10:10 pm, Andy Shevchenko wrote:
> > On Mon, Apr 13, 2020 at 8:37 PM 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.
> > ...
> > 
> > > +static int mp2629_charger_probe(struct platform_device *pdev)
> > > +{
> > > +       irq = platform_get_irq(to_platform_device(pdev->dev.parent), 0);
> > Why not to use temporary variable dev?
> > 
> > This should be platform_get_irq_optional().
> 
> Platform_get_irq in turn calls platform_get_irq_optional. It was suggested
> by Lee and is it mandatory to change it?

platform_get_irq is fine.

> > > +       if (irq) {

But this must be

if (irq > 0)

or you will also try to continue with error codes.

> > > +               ret = devm_request_irq(dev, irq, mp2629_irq_handler,
> > > +                                IRQF_TRIGGER_RISING, "mp2629-charger",
> > > +                                charger);
> > > +               if (ret) {
> > > +                       dev_err(dev, "failed to request gpio IRQ\n");
> > > +                       goto iio_fail;
> > > +               }
> > > +       }
> > > +}

-- Sebastian

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