regulator: Add LTC3589 support

This patch adds support for the Linear Technology LTC3589, LTC3589-1,
and LTC3589-2 8-output I2C voltage regulator ICs.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 903eb37..5599a61 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -265,6 +265,12 @@
 	help
 	  This driver supports LP8788 voltage regulator chip.
 
+config REGULATOR_LTC3589
+	bool "LTC3589 8-output voltage regulator"
+	help
+	  This enables support for the LTC3589, LTC3589-1, and LTC3589-2
+	  8-output regulators controlled via I2C.
+
 config REGULATOR_MAX14577
 	tristate "Maxim 14577 regulator"
 	depends on MFD_MAX14577