drivers: hwmon: add driver for max42500

The MAX42500 is a SoC power-system monitor with up to seven voltage
monitor inputs that will be SIL 3-Certified. Each input has programmable
OV/UV thresholds of between 2.5% and 10% with ±1.3% accuracy over the full
temperature range. Two of the inputs have a separate remote ground-sense
input and support DVS through the integrated I2C interface.

The MAX42500 contains a programmable flexible power sequence recorder
(FPSR). This recorder stores power-up and power-down timestamps separately,
and supports on/off and sleep/standby power sequences. The MAX42500 also
contains a programmable challenge/response watchdog, which is accessible
through the I2C interface, along with a configurable RESET output.

Signed-off-by: Kent Libetario <Kent.Libetario@analog.com>

Author: kentlibe

drivers/hwmon/Kconfig

@@ -1131,6 +1131,19 @@ config MAX31827
 	  This driver can also be built as a module.  If so, the module
 	  will be called max31827.
 
+config SENSORS_MAX42500
+	tristate "MAX42500 Industrial Power System Monitor Family"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for MAX42500 SoC power-system monitor
+	  with up to seven voltage monitor. The driver also contains a  programmable
+	  challenge/response watchdog, which is accessible through the I2C interface,
+	  along with a configurable RESET output.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called max42500.
+
 config SENSORS_MAX6620
 	tristate "Maxim MAX6620 fan controller"
 	depends on I2C

drivers/hwmon/Makefile

@@ -145,6 +145,7 @@ obj-$(CONFIG_SENSORS_MAX197)	+= max197.o
 obj-$(CONFIG_SENSORS_MAX31722)	+= max31722.o
 obj-$(CONFIG_SENSORS_MAX31730)	+= max31730.o
 obj-$(CONFIG_SENSORS_MAX31760)  += max31760.o
+obj-$(CONFIG_SENSORS_MAX42500)  += max42500.o
 obj-$(CONFIG_SENSORS_MAX6620)	+= max6620.o
 obj-$(CONFIG_SENSORS_MAX6621)	+= max6621.o
 obj-$(CONFIG_SENSORS_MAX6639)	+= max6639.o