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.