tps6586x: Add device tree support

This commit adds device tree support for the TPS6586x regulator.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/include/linux/mfd/tps6586x.h b/include/linux/mfd/tps6586x.h
index b19176e..f350fd0 100644
--- a/include/linux/mfd/tps6586x.h
+++ b/include/linux/mfd/tps6586x.h
@@ -68,6 +68,7 @@
 	int		id;
 	const char	*name;
 	void		*platform_data;
+	struct device_node *of_node;
 };
 
 struct tps6586x_platform_data {