gpio: arizona: Use the of_node from the Arizona device

We need to use the of_node from the main Arizona device as that
holds our configuration.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-arizona.c b/drivers/gpio/gpio-arizona.c
index a2bec3c..dceb5dc 100644
--- a/drivers/gpio/gpio-arizona.c
+++ b/drivers/gpio/gpio-arizona.c
@@ -109,6 +109,9 @@
 	arizona_gpio->arizona = arizona;
 	arizona_gpio->gpio_chip = template_chip;
 	arizona_gpio->gpio_chip.dev = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+	arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
+#endif
 
 	switch (arizona->type) {
 	case WM5102: