linux-kernel - Re: [PATCH V2] leds: pca963x: Add ACPI support

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Date:   Tue, 29 Nov 2016 13:04:00 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:     Tin Huynh <tnhuynh@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        Loc Ho <lho@....com>, Thang Nguyen <tqnguyen@....com>,
        Phong Vo <pvo@....com>, patches@....com
Subject: Re: [PATCH V2] leds: pca963x: Add ACPI support

On Tue, Nov 29, 2016 at 11:55:47AM +0100, Jacek Anaszewski wrote:
> On 11/29/2016 11:21 AM, Tin Huynh wrote:
> > This patch enables ACPI support for leds-pca963x driver.
> > 
> > Signed-off-by: Tin Huynh <tnhuynh@....com>
> > ---
> >  drivers/leds/leds-pca963x.c |   25 ++++++++++++++++++++++++-
> >  1 files changed, 24 insertions(+), 1 deletions(-)
> > 
> > Change from V1:
> >   -Add CONFIG_ACPI.
> > 
> > diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
> > index 407eba1..57f11e3 100644
> > --- a/drivers/leds/leds-pca963x.c
> > +++ b/drivers/leds/leds-pca963x.c
> > @@ -25,6 +25,7 @@
> >   * or by adding the 'nxp,hw-blink' property to the DTS.
> >   */
> > 
> > +#include <linux/acpi.h>
> >  #include <linux/module.h>
> >  #include <linux/delay.h>
> >  #include <linux/string.h>
> > @@ -95,6 +96,17 @@ struct pca963x_chipdef {
> >  };
> >  MODULE_DEVICE_TABLE(i2c, pca963x_id);
> > 
> > +#ifdef CONFIG_ACPI
> > +static const struct acpi_device_id pca963x_acpi_ids[] = {
> > +	{ "PCA9632", pca9633 },
> > +	{ "PCA9633", pca9633 },
> > +	{ "PCA9634", pca9634 },
> > +	{ "PCA9635", pca9635 },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(acpi, pca963x_acpi_ids);
> > +#endif
> > +
> >  struct pca963x_led;
> > 
> >  struct pca963x {
> > @@ -322,7 +334,17 @@ static int pca963x_probe(struct i2c_client *client,
> >  	struct pca963x_chipdef *chip;
> >  	int i, err;
> > 
> > -	chip = &pca963x_chipdefs[id->driver_data];
> > +	if (id) {
> > +		chip = &pca963x_chipdefs[id->driver_data];
> > +	} else {
> > +		const struct acpi_device_id *acpi_id;
> > +
> > +		acpi_id = acpi_match_device(ACPI_PTR(pca963x_acpi_ids),
> > +						&client->dev);
> 
> What kind of problem did you get while compiling without ACPI_PTR here,
> when CONFIG_ACPI is disabled? I also tried this configuration but
> nothing wrong happened. Also at first glance I don't see why lack of
> ACPI_PTR macro could cause problems.
> 
> Grep also doesn't show any call to acpi_match_device
> with ACPI_PTR as the first argument in the existing drivers.

Indeed, that is not needed at all.