gpio: tps65910: initialize of_node of gpio_chip

Initialize the gpio chip's of_node to the device's node
to work with DT based system.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-tps65910.c b/drivers/gpio/gpio-tps65910.c
index c1ad288..0749f96 100644
--- a/drivers/gpio/gpio-tps65910.c
+++ b/drivers/gpio/gpio-tps65910.c
@@ -149,6 +149,7 @@
 	tps65910_gpio->gpio_chip.set	= tps65910_gpio_set;
 	tps65910_gpio->gpio_chip.get	= tps65910_gpio_get;
 	tps65910_gpio->gpio_chip.dev = &pdev->dev;
+	tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
 	if (pdata && pdata->gpio_base)
 		tps65910_gpio->gpio_chip.base = pdata->gpio_base;
 	else