linux-kernel - RE: [RFC PATCH 4/4] pinctrl: Parse GpioInt/GpioIo resources

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Date:	Mon, 4 Apr 2016 14:05:33 +0000
From:	"Tirdea, Irina" <irina.tirdea@...el.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	"Heikki Krogerus" <heikki.krogerus@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	"Purdila, Octavian" <octavian.purdila@...el.com>,
	"Ciocan, Cristina" <cristina.ciocan@...el.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH 4/4] pinctrl: Parse GpioInt/GpioIo resources



> -----Original Message-----
> From: Mika Westerberg [mailto:mika.westerberg@...ux.intel.com]
> Sent: 04 April, 2016 16:48
> To: Tirdea, Irina
> Cc: Rafael J. Wysocki; Len Brown; Linus Walleij; linux-gpio@...r.kernel.org; linux-acpi@...r.kernel.org; Rob Herring; Heikki Krogerus;
> Andy Shevchenko; Purdila, Octavian; Ciocan, Cristina; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [RFC PATCH 4/4] pinctrl: Parse GpioInt/GpioIo resources
> 
> On Thu, Mar 31, 2016 at 02:44:45PM +0300, Irina Tirdea wrote:
> > +static int acpi_parse_gpio_res(struct pinctrl *p,
> > +			       struct pinctrl_map **map,
> > +			       unsigned *num_maps,
> > +			       struct pinctrl_dev ***pctldevs)
> > +{
> > +	struct acpi_gpio_lookup lookup;
> > +	struct list_head res_list;
> > +	struct acpi_device *adev;
> > +	unsigned int index;
> > +	int ret;
> > +
> > +	adev = ACPI_COMPANION(p->dev);
> > +
> > +	*map = NULL;
> > +	*num_maps = 0;
> > +	memset(&lookup, 0, sizeof(lookup));
> > +
> > +	/* Parse all GpioInt/GpioIo resources in _CRS and extract pin conf */
> > +	for (index = 0; ; index++) {
> > +		lookup.index = index;
> > +		lookup.n = 0;
> > +		lookup.found = false;
> > +
> > +		INIT_LIST_HEAD(&res_list);
> > +		ret = acpi_dev_get_resources(adev, &res_list, acpi_gpio_to_map,
> > +					     &lookup);
> > +		if (ret < 0)
> > +			goto exit_free;
> > +		acpi_dev_free_resource_list(&res_list);
> > +		if (!lookup.found)
> > +			break;
> > +	}
> > +
> > +	*map = lookup.map;
> > +	*num_maps = lookup.num_maps;
> > +	*pctldevs = lookup.pctldevs;
> 
> This function has quite many stars in arguments and in the function
> body. In particular pctldevs has three stars!
> 
> I wonder if this could be written in such way that avoids that. Like
> create a structure holding the map information and pass that to the
> function instead.
> 


Yes, that would make the code more clear. I will rewrite it using a structure.

> Other parts of the patch look good to me.