linux-kernel - Re: [PATCH v1 8/8] pwm-pca9685: enable ACPI device found on Galileo Gen2

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Message-ID: <1442997686.8361.161.camel@linux.intel.com>
Date:	Wed, 23 Sep 2015 11:41:26 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	linux-acpi@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-gpio@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mika Westerberg <mika.westerberg@...el.com>,
	"Puustinen, Ismo" <ismo.puustinen@...el.com>,
	"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 8/8] pwm-pca9685: enable ACPI device found on Galileo
 Gen2

On Tue, 2015-09-22 at 16:37 +0200, Thierry Reding wrote:
> On Tue, Sep 22, 2015 at 01:10:19PM +0300, Andy Shevchenko wrote:

> > --- a/drivers/pwm/pwm-pca9685.c
> > +++ b/drivers/pwm/pwm-pca9685.c
> > @@ -26,6 +26,8 @@
> >  #include <linux/regmap.h>
> >  #include <linux/slab.h>
> >  #include <linux/delay.h>
> > +#include <linux/acpi.h>
> > +#include <linux/property.h>
> 
> These should be kept sorted. I know that delay.h isn't properly 
> ordered
> either, I missed that during patch review. Please keep new ones 
> ordered
> alphabetically and I'll sort out the delay.h via a separate patch.

Will do in next version.

> @@ -363,6 +364,12 @@ static const struct i2c_device_id pca9685_id[]
> > = {
> >  };
> >  MODULE_DEVICE_TABLE(i2c, pca9685_id);
> >  
> > +static const struct acpi_device_id pca9685_acpi_ids[] = {
> > +	{ "INT3492", 0 },
> > +	{ /* sentinel */ },
> > +};
> > +MODULE_DEVICE_TABLE(acpi, pca9685_acpi_ids);
> > +
> >  static const struct of_device_id pca9685_dt_ids[] = {
> >  	{ .compatible = "nxp,pca9685-pwm", },
> >  	{ /* sentinel */ }
> > @@ -372,6 +379,7 @@ MODULE_DEVICE_TABLE(of, pca9685_dt_ids);
> >  static struct i2c_driver pca9685_i2c_driver = {
> >  	.driver = {
> >  		.name = "pca9685-pwm",
> > +		.acpi_match_table = ACPI_PTR(pca9685_acpi_ids),
> 
> I think you now need #ifdef protection for the ACPI ID table, 
> otherwise
> the compiler will warn that the table is unused for !ACPI.

No, there is no warning, just checked a build with CONFIG_ACPI=n.

Tried even with C=1 W=2, and driver compiled in and a module.
In all variants no warning regarding the topic is issued.

$ gcc --version
gcc (Debian 5.2.1-17) 5.2.1 20150911

Perhaps this would explain what is happening there.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28901

So, I will add #ifdef in the code as well, though I'm not a big fan of
conditional compilation.

> 
> >  		.of_match_table = pca9685_dt_ids,
> 
> Similarly to the above, this should use of_match_ptr(), which in turn
> will require #ifdef protection for the table to avoid warnings.

Hmm... my patch do not touches that part. Perhaps another patch for
this?

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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