linux-kernel - Re: [PATCH 10/10] hwmon: vexpress: Use devm helper for hwmon device registration

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Message-ID: <1398870979.24255.37.camel@hornet>
Date:	Wed, 30 Apr 2014 16:16:19 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"arm@...nel.org" <arm@...nel.org>, Jean Delvare <jdelvare@...e.de>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: Re: [PATCH 10/10] hwmon: vexpress: Use devm helper for hwmon device
 registration

On Mon, 2014-04-28 at 23:59 +0100, Guenter Roeck wrote:
> On 04/28/2014 10:uct attribute_group **attr_groups;
> > @@ -114,10 +95,13 @@ struct vexpress_hwmon_type {
> >   static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
> >   static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
> >   		NULL, 1000);
> > -static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input);
> >   static struct attribute_group vexpress_hwmon_group_volt = {
> >   	.is_visible = vexpress_hwmon_attr_is_visible,
> > -	.attrs = vexpress_hwmon_attrs_volt,
> > +	.attrs = (struct attribute *[]) {
> 
> Is this typecast necessary ?

Yes, it's the gcc extension that allows compound literals to be used for
static structure members initialization. I like it, because it makes
them easier to understand (in my opinion, that is), but if you prefer
the classic approach, I'll unroll VEXPRESS_HWMON_ATTRS into:

static struct attribute vexpress_hwmon_attrs_volt = {
	&dev_attr_in1_label.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	NULL
};

And keep

static struct attribute_group vexpress_hwmon_group_volt = {
  	.is_visible = vexpress_hwmon_attr_is_visible,
	.attrs = vexpress_hwmon_attrs_volt,
};

> > @@ -232,45 +227,19 @@ static int vexpress_hwmon_probe(struct platform_device *pdev)
> >   	if (!match)
> >   		return -ENODEV;
> >   	type = match->data;
> > -	data->name = type->name;
> >
> >   	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
> > -	if (!data->reg)
> > -		return -ENODEV;
> > -
> > -	err = sysfs_create_groups(&pdev->dev.kobj, type->attr_groups);
> > -	if (err)
> > -		goto error;
> > -
> > -	data->hwmon_dev = hwmon_device_register(&pdev->dev);
> > -	if (IS_ERR(data->hwmon_dev)) {
> > -		err = PTR_ERR(data->hwmon_dev);
> > -		goto error;
> > -	}
> > +	if (IS_ERR(data->reg))
> > +		return PTR_ERR(data->reg);
> 
> Did the API for devm_regmap_init_vexpress_config change ?
> If so, it might make sense to separate this out into a separate patch,
> together with the API change (it is a logically different change).

I'm not sure I understand the question. The other patch from the series
I've copied you on
(http://article.gmane.org/gmane.linux.ports.arm.kernel/320577 "[PATCH
02/10] mfd: vexpress: Convert custom func API to regmap") changes

-       data->func = vexpress_config_func_get_by_dev(&pdev->dev);

into

+       data->reg = devm_regmap_init_vexpress_config(&pdev->dev);

Your ack there, by the way, will be really appreciated :-)

> One question - I seem to be unable to apply the patch. What is your
> baseline branch / repository ?

The whole series, based on v3.15-rc3 lives here:

	git://git.linaro.org/people/pawel.moll/linux.git vexpress/sysreg

Pawel

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