power: supply: Introduce Qualcomm PMIC GLINK power supply

The PMIC GLINK service, running on a coprocessor of modern Qualcomm
platforms, deals with battery charging and fuel gauging, as well as
reporting status of AC and wireless power supplies.

As this is just one of the functionalities provided by the PMIC GLINK
service, this power supply driver is implemented as an auxilirary bus
driver, spawned by the main "pmic glink" driver when the PMIC GLINK
service is detected.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Konrad Dybcio <konrad.dybcio@linaro.org> # SM8350 PDX215
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-MTP & SM8450-HDK
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230207144241.1767973-1-quic_bjorande@quicinc.com

drivers/power/supply/Kconfig

@@ -183,6 +183,15 @@ config BATTERY_PMU
 	  Say Y here to expose battery information on Apple machines
 	  through the generic battery class.
 
+config BATTERY_QCOM_BATTMGR
+	tristate "Qualcomm PMIC GLINK battery manager support"
+	depends on QCOM_PMIC_GLINK
+	select AUXILIARY_BUS
+	help
+	  Say Y here to enable the Qualcomm PMIC GLINK power supply driver,
+	  which is used on modern Qualcomm platforms to provide battery and
+	  power supply information.
+
 config BATTERY_OLPC
 	tristate "One Laptop Per Child battery"
 	depends on OLPC_EC

drivers/power/supply/Makefile

@@ -34,6 +34,7 @@ obj-$(CONFIG_BATTERY_GAUGE_LTC2941)	+= ltc2941-battery-gauge.o
 obj-$(CONFIG_BATTERY_GOLDFISH)	+= goldfish_battery.o
 obj-$(CONFIG_BATTERY_LEGO_EV3)	+= lego_ev3_battery.o
 obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o
+obj-$(CONFIG_BATTERY_QCOM_BATTMGR)	+= qcom_battmgr.o
 obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o
 obj-$(CONFIG_BATTERY_SAMSUNG_SDI)	+= samsung-sdi-battery.o
 obj-$(CONFIG_BATTERY_TOSA)	+= tosa_battery.o