power: supply: Add a driver for Injoinic power bank ICs

This driver supports several chip variants which all share the same I2C
register interface. Since the chip will turn off and become inaccessible
under conditions outside of software control (e.g. upon button press or
input voltage removal), some special handling is needed to delay the
initialization of the IC until it is accessible.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

MAINTAINERS

@@ -9461,6 +9461,11 @@ F:	include/linux/mfd/ingenic-tcu.h
 F:	sound/soc/codecs/jz47*
 F:	sound/soc/jz4740/
 
+INJOINIC IP5xxx POWER BANK IC DRIVER
+M:	Samuel Holland <samuel@sholland.org>
+S:	Maintained
+F:	drivers/power/supply/ip5xxx_power.c
+
 INOTIFY
 M:	Jan Kara <jack@suse.cz>
 R:	Amir Goldstein <amir73il@gmail.com>

drivers/power/supply/Kconfig

@@ -51,6 +51,14 @@ config GENERIC_ADC_BATTERY
 	  Say Y here to enable support for the generic battery driver
 	  which uses IIO framework to read adc.
 
+config IP5XXX_POWER
+	tristate "Injoinic IP5xxx power bank IC driver"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say Y to include support for Injoinic IP5xxx power bank ICs,
+	  which include a battery charger and a boost converter.
+
 config MAX8925_POWER
 	tristate "MAX8925 battery charger support"
 	depends on MFD_MAX8925

drivers/power/supply/Makefile

@@ -12,6 +12,7 @@ obj-$(CONFIG_GENERIC_ADC_BATTERY)	+= generic-adc-battery.o
 obj-$(CONFIG_PDA_POWER)		+= pda_power.o
 obj-$(CONFIG_APM_POWER)		+= apm_power.o
 obj-$(CONFIG_AXP20X_POWER)	+= axp20x_usb_power.o
+obj-$(CONFIG_IP5XXX_POWER)	+= ip5xxx_power.o
 obj-$(CONFIG_MAX8925_POWER)	+= max8925_power.o
 obj-$(CONFIG_WM831X_BACKUP)	+= wm831x_backup.o
 obj-$(CONFIG_WM831X_POWER)	+= wm831x_power.o