hwmon: (emc2305) add support for EMC2301/2/3/5 RPM-based PWM Fan Spee…

…d Controller.

Add driver for Microchip EMC2301/2/3/5 RPM-based PWM Fan Speed Controller.
Modify Makefile and Kconfig to support Microchip EMC2305 RPM-based
PWM Fan Speed Controller.

Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20220810171552.56417-3-michaelsh@nvidia.com
[groeck: Drop unnecessary () around DIV_ROUND_CLOSEST()]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/Kconfig

@@ -1785,6 +1785,19 @@ config SENSORS_EMC2103
 	  This driver can also be built as a module. If so, the module
 	  will be called emc2103.
 
+config SENSORS_EMC2305
+	tristate "Microchip EMC2305 and compatible EMC2301/2/3"
+	depends on I2C
+	imply THERMAL
+	help
+	  If you say yes here you get support for the Microchip EMC2305
+	  fan controller chips.
+	  The Microchip EMC2305 is a fan controller for up to 5 fans.
+	  Fan rotation speeds are reported in RPM.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called emc2305.
+
 config SENSORS_EMC6W201
 	tristate "SMSC EMC6W201"
 	depends on I2C

drivers/hwmon/Makefile

@@ -69,6 +69,7 @@ obj-$(CONFIG_SENSORS_DS620)	+= ds620.o
 obj-$(CONFIG_SENSORS_DS1621)	+= ds1621.o
 obj-$(CONFIG_SENSORS_EMC1403)	+= emc1403.o
 obj-$(CONFIG_SENSORS_EMC2103)	+= emc2103.o
+obj-$(CONFIG_SENSORS_EMC2305)	+= emc2305.o
 obj-$(CONFIG_SENSORS_EMC6W201)	+= emc6w201.o
 obj-$(CONFIG_SENSORS_F71805F)	+= f71805f.o
 obj-$(CONFIG_SENSORS_F71882FG)	+= f71882fg.o