[PATCH] gpio: Add simple poweroff-gpio driver

The main issue is where to put it. I'm not convinced that drivers/gpio
is an appropriate home, however drivers/power and drivers/hwmon (where
drivers with similar purpose live) contain frameworks this is not part
of. drivers/mfd has some modules that can power off, but this is hardly
multifunction :) Could also give in and use drivers/misc.

Feedback appreciated.

Humm, sorry, no idea...

+static int __devinit gpio_poweroff_probe(struct platform_device *pdev)
+{
+	enum of_gpio_flags flags;
+
+	gpio_num = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
+	if (gpio_num < 0) {
+		pr_err("%s: Could not get GPIO configuration: %d",
+		       __func__, gpio_num);
+		return -ENODEV;
+	}
+	gpio_active_low = flags & OF_GPIO_ACTIVE_LOW;

If you look at the Kirkwood/Orion5x, most systems that could use this
are currently not DT enabled. So i think it needs old style
platform_data as well as OF.

+static int __devexit gpio_poweroff_remove(struct platform_device *pdev)
+{
+	if (gpio_num)
+		gpio_free(gpio_num);

GPIO 0 is a valid GPIO number. You should not need this check, since
if the probe function succeeded, you have a valid GPIO.

    Andrew