hwmon: add driver support 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

Documentation/devicetree/bindings/hwmon/adi,max42500.yml

@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/adi,max42500.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX42500 Industrial Power System Monitor
+
+maintainers:
+  - Kent Libetario <Kent.Libetario@analog.com>
+
+description: |
+  Analog Devices MAX42500 Industrial Power System Monitor Family
+  https://www.analog.com/media/en/technical-documentation/data-sheets/max42500.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,max42500
+
+  reg:
+    description: I2C address of slave device.
+    minimum: 0x28
+    maximum: 0x2B
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        hwmon@28 {
+            reg = <0x28>;
+            compatible = "adi,max42500";
+        };
+    };

drivers/hwmon/Kconfig

@@ -2403,6 +2403,19 @@ config SENSORS_ASUS_EC
 	  This driver can also be built as a module. If so, the module
 	  will be called asus_ec_sensors.
 
+config 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.
+
 endif # ACPI
 
 endif # HWMON

drivers/hwmon/Kconfig.adi

@@ -44,4 +44,5 @@ config HWMON_ALL_ADI_DRIVERS
 	imply MAX31827
 	imply SENSORS_MAX31760
 	imply SENSORS_LT7182S
+	imply MAX42500
 

drivers/hwmon/Makefile

@@ -142,6 +142,7 @@ 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