linux-kernel - Re: [PATCH v3 13/15] input: gpio_keys_polled

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Message-ID: <20141001162802.GD23115@dtor-glaptop>
Date:	Wed, 1 Oct 2014 09:28:02 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	devicetree@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Aaron Lu <aaron.lu@...el.com>,
	Darren Hart <dvhart@...ux.intel.com>
Subject: Re: [PATCH v3 13/15] input: gpio_keys_polled - Add ACPI probing
 support

On Wed, Oct 01, 2014 at 12:15:35PM +0300, Mika Westerberg wrote:
> On Wed, Oct 01, 2014 at 12:48:46AM -0700, Dmitry Torokhov wrote:
> > On Wed, Oct 01, 2014 at 04:20:43AM +0200, Rafael J. Wysocki wrote:
> > > From: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > > 
> > > Allow the driver to probe from ACPI namespace.
> > > 
> > > Signed-off-by: Aaron Lu <aaron.lu@...el.com>
> > > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > ---
> > >  drivers/input/keyboard/gpio_keys_polled.c |    7 +++++++
> > >  1 file changed, 7 insertions(+)
> > > 
> > > Index: linux-pm/drivers/input/keyboard/gpio_keys_polled.c
> > > ===================================================================
> > > --- linux-pm.orig/drivers/input/keyboard/gpio_keys_polled.c
> > > +++ linux-pm/drivers/input/keyboard/gpio_keys_polled.c
> > > @@ -181,6 +181,12 @@ static const struct of_device_id gpio_ke
> > >  };
> > >  MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
> > >  
> > > +static const struct acpi_device_id gpio_keys_polled_acpi_match[] = {
> > > +	{ "PRP0001" }, /* Device Tree shoehorned into ACPI */
> > > +	{ },
> > > +};
> > > +MODULE_DEVICE_TABLE(acpi, gpio_keys_polled_acpi_match);
> > > +
> > >  static int gpio_keys_polled_probe(struct platform_device *pdev)
> > >  {
> > >  	struct device *dev = &pdev->dev;
> > > @@ -309,6 +315,7 @@ static struct platform_driver gpio_keys_
> > >  		.name	= DRV_NAME,
> > >  		.owner	= THIS_MODULE,
> > >  		.of_match_table = gpio_keys_polled_of_match,
> > > +		.acpi_match_table = gpio_keys_polled_acpi_match,
> > o
> > Hmm, why do we need the generic "PRP0001" in every driver? The ACPI device
> > should have PRP0001 and ACPI bus should know to look into OF matching table
> > for such devices.
> 
> Arnd had a good idea for this. How about,
> 
> 	.acpi_match_table = acpi_match_by_of_compatible,
> 
> where acpi_match_by_of_compatible is provided by ACPI core? Does that
> work better for you?

I still do not see the point. ACPI core knows how to handle
drv->of_match_table, so unless we need to support ACPI_only binding in a
given driver I do not understand why we need to add boilerplate code.

Thanks.

-- 
Dmitry
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