adp5061: New driver for ADP5061 I2C battery charger

This patch adds basic support for Analog Devices I2C programmable linear
battery charger.

With this driver, some parameters can be read and configured such as:
* trickle charge current level (PRECHARGE_CURRENT)
* trickle charge voltage threshold (VOLTAGE_MIN)
* weak charge threshold (VOLTAGE_AVG)
* constant current (CONSTANT_CHARGE_CURRENT)
* constant charge voltage limit (CONSTANT_CHARGE_VOLTAGE_MAX)
* battery full (CAPACITY_LEVEL)
* input current limit (INPUT_CURRENT_LIMIT)
* charger status (STATUS)
* battery status (CAPACITY_LEVEL)
* termination current (CHARGE_TERM_CURRENT)

Datasheet:
http://www.analog.com/media/en/technical-documentation/data-sheets/ADP5061.pdfSigned-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

MAINTAINERS

@@ -810,6 +810,13 @@ L:	linux-media@vger.kernel.org
 S:	Maintained
 F:	drivers/media/i2c/ad9389b*
 
+ANALOG DEVICES INC ADP5061 DRIVER
+M:	Stefan Popa <stefan.popa@analog.com>
+L:	linux-pm@vger.kernel.org
+W:	http://ez.analog.com/community/linux-device-drivers
+S:	Supported
+F:	drivers/power/supply/adp5061.c
+
 ANALOG DEVICES INC ADV7180 DRIVER
 M:	Lars-Peter Clausen <lars@metafoo.de>
 L:	linux-media@vger.kernel.org

drivers/power/supply/Kconfig

@@ -75,6 +75,17 @@ config BATTERY_88PM860X
 	help
 	  Say Y here to enable battery monitor for Marvell 88PM860x chip.
 
+config CHARGER_ADP5061
+	tristate "ADP5061 battery charger driver"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say Y here to enable support for the ADP5061 standalone battery
+	  charger.
+
+	  This driver can be built as a module. If so, the module will be
+	  called adp5061.
+
 config BATTERY_ACT8945A
 	tristate "Active-semi ACT8945A charger driver"
 	depends on MFD_ACT8945A || COMPILE_TEST

drivers/power/supply/Makefile

@@ -18,6 +18,7 @@ obj-$(CONFIG_WM8350_POWER)	+= wm8350_power.o
 obj-$(CONFIG_TEST_POWER)	+= test_power.o
 
 obj-$(CONFIG_BATTERY_88PM860X)	+= 88pm860x_battery.o
+obj-$(CONFIG_CHARGER_ADP5061)	+= adp5061.o
 obj-$(CONFIG_BATTERY_ACT8945A)	+= act8945a_charger.o
 obj-$(CONFIG_BATTERY_AXP20X)	+= axp20x_battery.o
 obj-$(CONFIG_CHARGER_AXP20X)	+= axp20x_ac_power.o