linux-kernel - RE: [RFC PATCH 3/4] pinctrl: Add ACPI support

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Date:	Mon, 4 Apr 2016 13:13:43 +0000
From:	"Tirdea, Irina" <irina.tirdea@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	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>
CC:	Rob Herring <robh+dt@...nel.org>,
	Heikki Krogerus <heikki.krogerus@...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 3/4] pinctrl: Add ACPI support



> -----Original Message-----
> From: Andy Shevchenko [mailto:andriy.shevchenko@...ux.intel.com]
> Sent: 01 April, 2016 17:15
> To: Tirdea, Irina; Rafael J. Wysocki; Len Brown; Mika Westerberg; Linus Walleij; linux-gpio@...r.kernel.org; linux-
> acpi@...r.kernel.org
> Cc: Rob Herring; Heikki Krogerus; Purdila, Octavian; Ciocan, Cristina; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [RFC PATCH 3/4] pinctrl: Add ACPI support
> 
> On Thu, 2016-03-31 at 14:44 +0300, Irina Tirdea wrote:
> > Add ACPI support for pin controller properties. These are
> > based on ACPI _DSD properties and follow the device tree
> > model based on states and node configurations. The states
> > are defined as _DSD properties and configuration nodes
> > are defined using the _DSD Hierarchical Properties Extension.
> >
> > A configuration node supports the generic device tree properties.
> >
> > The implementation is based on device tree code from devicetree.c.
> >
> 
> Patch is good to me, though few minor comments below.
> 
> > +/**
> > + * struct pinctrl_acpi_map - mapping table chunk parsed from ACPI
> > + * @node: list node for struct pinctrl's @fw_maps field
> > + * @pctldev: the pin controller that allocated this struct, and will
> > free it
> 
> > + * @maps: the mapping table entries
> 
> We have @map and @num_maps.
Right, I'll add num_maps description.
> 
> > + */
> > +struct pinctrl_acpi_map {
> > +	struct list_head node;
> > +	struct pinctrl_dev *pctldev;
> > +	struct pinctrl_map *map;
> > +	unsigned num_maps;
> > +};
> > +
> >
> 
> > +static int acpi_remember_or_free_map(struct pinctrl *p, const char
> > *statename,
> > +				     struct pinctrl_dev *pctldev,
> > +				     struct pinctrl_map *map,
> > unsigned num_maps)
> > +{
> > +	struct pinctrl_acpi_map *acpi_map;
> > +	struct list_head *acpi_maps;
> 
> 
> > +	unsigned int i;
> 
> Just unsigned i to be in align with unsigned num_maps.
>
OK.
> > +
> > +	/* Initialize common mapping table entry fields */
> > +	for (i = 0; i < num_maps; i++) {
> > +		map[i].dev_name = dev_name(p->dev);
> > +		map[i].name = statename;
> > +		if (pctldev)
> > +			map[i].ctrl_dev_name = dev_name(pctldev-
> > >dev);
> > +	}
> 
> 
> > +int pinctrl_acpi_to_map(struct pinctrl *p)
> > +{
> > +	const union acpi_object *prop, *statenames, *configs;
> > +	unsigned int state, nstates, nconfigs, config;
> > +	char *statename, *propname, *configname;
> > +	struct fwnode_handle *fw_prop;
> > +	struct acpi_device *adev;
> > +	int ret;
> > +
> > +	/* We may store pointers to property names within the node
> > */
> > +	adev = acpi_bus_get_acpi_device(ACPI_HANDLE(p->dev));
> > +	if (!adev)
> > +		return -ENODEV;
> > +
> 
> > +	/* Only allow named states (device must have prop 'pinctrl-
> > names') */
> 
> Does it fit one line?
> 
It has 77 characters, so it should fit one line.
> > +err_free_map:
> 
> Perhaps err_free_maps?
> 
OK.
> > +	pinctrl_acpi_free_maps(p);
> > +	return ret;
> 
> --
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Intel Finland Oy