TPS65910: GPIO: Add GPIO driver

TPS65910 has one configurable GPIO that can be used for several
purposes. Subsequent versions of the TPS chip support more than
one GPIO.

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/mfd/tps65910.c

@@ -135,8 +135,13 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct tps65910 *tps65910;
+	struct tps65910_board *pmic_plat_data;
 	int ret = 0;
 
+	pmic_plat_data = dev_get_platdata(&i2c->dev);
+	if (!pmic_plat_data)
+		return -EINVAL;
+
 	tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
 	if (tps65910 == NULL)
 		return -ENOMEM;
@@ -154,6 +159,8 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 	if (ret < 0)
 		goto err;
 
+	tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
+
 	return ret;
 
 err: