mfd: bd70528: Support ROHM bd70528 PMIC core

ROHM BD70528MWV is an ultra-low quiescent current general
purpose single-chip power management IC for battery-powered
portable devices.

Add MFD core which enables chip access for following subdevices:
	- regulators/LED drivers
	- battery-charger
	- gpios
	- 32.768kHz clk
	- RTC
	- watchdog
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/Kconfig

@@ -1890,6 +1890,23 @@ config MFD_ROHM_BD718XX
 	  NXP i.MX8. It contains 8 BUCK outputs and 7 LDOs, voltage monitoring
 	  and emergency shut down as well as 32,768KHz clock output.
 
+config MFD_ROHM_BD70528
+	tristate "ROHM BD70528 Power Management IC"
+	depends on I2C=y
+	depends on OF
+	select REGMAP_I2C
+	select REGMAP_IRQ
+	select MFD_CORE
+	help
+	  Select this option to get support for the ROHM BD70528 Power
+	  Management IC. BD71837 is general purpose single-chip power
+	  management IC for battery-powered portable devices. It contains
+	  3 ultra-low current consumption buck converters, 3 LDOs and 2 LED
+	  drivers. Also included are 4 GPIOs, a real-time clock (RTC), a 32kHz
+	  crystal oscillator, high-accuracy VREF for use with an external ADC,
+	  10 bits SAR ADC for battery temperature monitor and 1S battery
+	  charger.
+
 config MFD_STM32_LPTIMER
 	tristate "Support for STM32 Low-Power Timer"
 	depends on (ARCH_STM32 && OF) || COMPILE_TEST

drivers/mfd/Makefile

@@ -247,5 +247,7 @@ obj-$(CONFIG_MFD_STM32_TIMERS) 	+= stm32-timers.o
 obj-$(CONFIG_MFD_MXS_LRADC)     += mxs-lradc.o
 obj-$(CONFIG_MFD_SC27XX_PMIC)	+= sprd-sc27xx-spi.o
 obj-$(CONFIG_RAVE_SP_CORE)	+= rave-sp.o
+obj-$(CONFIG_MFD_ROHM_BD70528)	+= rohm-bd70528.o
 obj-$(CONFIG_MFD_ROHM_BD718XX)	+= rohm-bd718x7.o
 obj-$(CONFIG_MFD_STMFX) 	+= stmfx.o
+