regulator: 88pm800: add regulator driver for 88pm800

Add the regulator driver for PMIC 88pm800 including device tree
support.
88pm800 is an I2C-based power-management IC containing voltage
regulators, a real-time clock, and some general purpose ADC devices,

Signed-off-by: Yi Zhang <yizhang@marvell.com>
Signed-off-by: Chao Xie <chao.xie@marvell.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 759b601..65b7d5b 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -64,6 +64,16 @@
 
 	  If unsure, say no.
 
+config REGULATOR_88PM800
+	tristate "Marvell 88PM800 Power regulators"
+	depends on MFD_88PM800=y
+	help
+	  This driver supports Marvell 88PM800 voltage regulator chips.
+	  It delivers digitally programmable output,
+	  the voltage is programmed via I2C interface.
+	  It's suitable to support PXA988 chips to control VCC_MAIN and
+	  various voltages.
+
 config REGULATOR_88PM8607
 	bool "Marvell 88PM8607 Power regulators"
 	depends on MFD_88PM860X=y