linux-kernel - Re: [PATCH v3 09/15] leds: leds-gpio: Make use of device property API

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Date:	Sat, 04 Oct 2014 02:18:10 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Mark Rutland <mark.rutland@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	"grant.likely@...aro.org" <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 09/15] leds: leds-gpio: Make use of device property API

On Friday, October 03, 2014 03:07:28 PM Mark Rutland wrote:
> On Wed, Oct 01, 2014 at 03:16:25AM +0100, Rafael J. Wysocki wrote:
> > From: Max Eliaser <max@...iaserlow.dyndns.tv>
> > 
> > Make use of device property API in this driver so that both OF and ACPI
> > based system can use the same driver.
> > 
> > Signed-off-by: Max Eliaser <max.eliaser@...el.com>
> > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> >  drivers/leds/leds-gpio.c |   99 +++++++++++++++++++----------------------------
> >  1 file changed, 42 insertions(+), 57 deletions(-)
> > 
> > Index: linux-pm/drivers/leds/leds-gpio.c
> > ===================================================================
> > --- linux-pm.orig/drivers/leds/leds-gpio.c
> > +++ linux-pm/drivers/leds/leds-gpio.c
> > @@ -15,13 +15,11 @@
> >  #include <linux/gpio.h>
> >  #include <linux/gpio/consumer.h>
> >  #include <linux/leds.h>
> > -#include <linux/of.h>
> > -#include <linux/of_platform.h>
> > -#include <linux/of_gpio.h>
> >  #include <linux/slab.h>
> >  #include <linux/workqueue.h>
> >  #include <linux/module.h>
> >  #include <linux/err.h>
> > +#include <linux/property.h>
> >  
> >  struct gpio_led_data {
> >  	struct led_classdev cdev;
> > @@ -171,65 +169,59 @@ static inline int sizeof_gpio_leds_priv(
> >  		(sizeof(struct gpio_led_data) * num_leds);
> >  }
> >  
> > -/* Code to create from OpenFirmware platform devices */
> > -#ifdef CONFIG_OF_GPIO
> > -static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
> > +static int gpio_leds_create_led(struct device *dev, void *child, void *data)
> > +{
> > +	struct gpio_leds_priv *priv = data;
> > +	struct gpio_led led = {};
> > +	const char *state = NULL;
> > +
> > +	led.gpiod = devm_get_named_gpiod_from_child(dev, child, "gpios", 0);
> > +	if (IS_ERR(led.gpiod))
> > +		return PTR_ERR(led.gpiod);
> > +
> > +	device_child_property_read_string(dev, child, "label", &led.name);
> > +	device_child_property_read_string(dev, child, "linux,default-trigger",
> > +					  &led.default_trigger);
> > +
> > +	device_child_property_read_string(dev, child, "linux,default_state",
> > +					  &state);
> 
> Do we really want "linux," properties in ACPI tables?

Yes, we do.

"linux" here need not mean this is Linux-specific.

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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