linux-kernel - Re: [RFC PATCH v2 07/16] gpio: Add support for unified device properties interface

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Date:	Wed, 24 Sep 2014 12:38:23 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Darren Hart <dvhart@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	David Woodhouse <david.woodhouse@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Lee Jones <lee.jones@...aro.org>, Aaron Lu <aaron.lu@...el.com>
Subject: Re: [RFC PATCH v2 07/16] gpio: Add support for unified device
 properties interface

On Wed, Sep 24, 2014 at 11:12:36AM +0200, Arnd Bergmann wrote:
> As a start, we could probably take the proposed device_for_each_child_node
> and move that into the leds-core, changing the fw_dev_node argument
> for an led_classdev with the addition of the of_node and acpi_object
> members. It would still leave it up to the gpio-leds driver to do
> 
> 	if (led_cdev->of_node)
> 		gpiod = devm_of_get_gpiod(led_cdev->of_node, ...);
> 	else
> 		gpiod = devm_acpi_get_gpiod(led_cdev->acpi_object, ...);
> 
> but there seems little benefit in abstracting this because there is
> only one driver that needs it.

The same interface is used also in gpio_keys_polled.c driver so if we
want to avoid duplicating code this needs to be abstracted away from the
drivers.
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