linux-kernel - Re: [PATCH v6 09/10] power: supply: Support ROHM bd99954 charger

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Message-ID: <20200325120531.GV1922688@smile.fi.intel.com>
Date:   Wed, 25 Mar 2020 14:05:31 +0200
From:   "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
To:     "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
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Subject: Re: [PATCH v6 09/10] power: supply: Support ROHM bd99954 charger

On Wed, Mar 25, 2020 at 10:14:35AM +0000, Vaittinen, Matti wrote:
> On Tue, 2020-03-24 at 13:56 +0200, andriy.shevchenko@...ux.intel.com
> wrote:
> > On Tue, Mar 24, 2020 at 10:53:09AM +0000, Vaittinen, Matti wrote:
> > > On Tue, 2020-03-24 at 11:50 +0200, Andy Shevchenko wrote:
> > > > On Tue, Mar 24, 2020 at 10:32:19AM +0200, Matti Vaittinen wrote:

...

> > > > > +	if (!dev->platform_data) {
> > > > 
> > > > dev_get_platdata()
> > > > 
> > > > > +		ret = bd9995x_fw_probe(bd);
> > > > > +		if (ret < 0) {
> > > > > +			dev_err(dev, "Cannot read device
> > > > > properties.\n");
> > > > > +			return ret;
> > > > > +		}
> > > > > +	} else {
> > > > > +		return -ENODEV;
> > > > 
> > > > So, existing platform data leads to an error?!
> > > 
> > > Yes. As currently we only use DT. If someone needs platdata they
> > > need
> > > to improve the driver
> > 
> > I think the idea to avoid platform data in new code as much as
> > possible.
> > And it's unusual to have somebody to use this driver with
> > platform_data set.
> > Why not simple ignore it?
> 
> Because if someone _is_ using platform data here (and we still provide
> this mechanism) - then we should inform him that he's doing something
> which is not correct.

Up to maintainer, but once more time to put an accent that above is quite
unusual practice in Linux kernel.

-- 
With Best Regards,
Andy Shevchenko