tps65912: gpio: add gpio driver

TPS65912 has five GPIOs that can be configured for different
purposes.

Signed-off-by: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/include/linux/mfd/tps65912.h b/include/linux/mfd/tps65912.h
index be60fb2..aaceab4 100644
--- a/include/linux/mfd/tps65912.h
+++ b/include/linux/mfd/tps65912.h
@@ -275,6 +275,7 @@
 	int is_dcdc4_avs;
 	int irq;
 	int irq_base;
+	int gpio_base;
 	struct regulator_init_data *tps65912_pmic_init_data;
 };