power: supply: charger: add sc89890 charger driver

Signed-off-by: shengfei Xu <xsf@rock-chips.com>
Change-Id: Ie231a1cabdfefce43fc8f21993d981df2395cf31

Documentation/devicetree/bindings/power/supply/sc89890-charger.txt

@@ -0,0 +1,40 @@
+Binding for sc8990 Li-Ion Charger
+
+This driver will support the sc89890. There are
+other ICs in the same family but those have not been tested.
+
+Required properties:
+- compatible: "sc,sc89890"
+- reg: integer, i2c address of the device.
+- interrupts: interrupt line;
+- sc,battery-regulation-voltage: integer, maximum charging voltage (in uV);
+- sc,charge-current: integer, maximum charging current (in uA);
+- sc,termination-current: integer, charge will be terminated when current in
+    constant-voltage phase drops below this value (in uA);
+- sc,precharge-current: integer, maximum charge current during precharge
+    phase (in uA);
+- sc,minimum-sys-voltage: integer, when battery is charging and it is below
+    minimum system voltage, the system will be regulated above
+    minimum-sys-voltage setting (in uV);
+- sc,boost-voltage: integer, VBUS voltage level in boost mode (in uV);
+- sc,boost-max-current: integer, maximum allowed current draw in boost mode
+    (in uA).
+
+Example:
+
+sc89890 {
+	compatible = "sc,sc89890";
+	reg = <0x6a>;
+
+	interrupt-parent = <&gpio0>;
+	interrupts = <RK_PD5 IRQ_TYPE_EDGE_FALLING>;
+
+	sc,battery-regulation-voltage = <4200000>;
+	sc,charge-current = <1000000>;
+	sc,termination-current = <50000>;
+	sc,precharge-current = <128000>;
+	sc,minimum-sys-voltage = <3600000>;
+	sc,boost-voltage = <5000000>;
+	sc,boost-max-current = <1000000>;
+	sc,ibatcomp-micro-ohms = <10>;
+};

drivers/power/supply/Kconfig

@@ -542,6 +542,14 @@ config CHARGER_SC8551
 	help
 	  Say Y to enable support for the SC8551 battery pump charger.
 
+config CHARGER_SC89890
+	tristate "SC89890 battery charger driver"
+	depends on I2C
+	depends on GPIOLIB || COMPILE_TEST
+	select REGMAP_I2C
+	help
+	  Say Y to enable support for the SC89890 battery charger.
+
 config CHARGER_MAX14577
 	tristate "Maxim MAX14577/77836 battery charger driver"
 	depends on MFD_MAX14577

drivers/power/supply/Makefile

@@ -90,6 +90,7 @@ obj-$(CONFIG_CHARGER_BQ25890)	+= bq25890_charger.o
 obj-$(CONFIG_CHARGER_BQ25980)	+= bq25980_charger.o
 obj-$(CONFIG_CHARGER_SMB347)	+= smb347-charger.o
 obj-$(CONFIG_CHARGER_SC8551)	+= sc8551_charger.o
+obj-$(CONFIG_CHARGER_SC89890)	+= sc89890_charger.o
 obj-$(CONFIG_CHARGER_TPS65090)	+= tps65090-charger.o
 obj-$(CONFIG_CHARGER_TPS65217)	+= tps65217_charger.o
 obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o