mfd: max8998: Add support for Device Tree

This patch adds Device Tree support to max8998 driver.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/include/linux/mfd/max8998.h b/include/linux/mfd/max8998.h
index ca56bb0..e3956a6 100644
--- a/include/linux/mfd/max8998.h
+++ b/include/linux/mfd/max8998.h
@@ -58,10 +58,12 @@
  * max8998_regulator_data - regulator data
  * @id: regulator id
  * @initdata: regulator init data (contraints, supplies, ...)
+ * @reg_node: DT node of regulator (unused on non-DT platforms)
  */
 struct max8998_regulator_data {
 	int				id;
 	struct regulator_init_data	*initdata;
+	struct device_node		*reg_node;
 };
 
 /**