hwmon: (mcp3021) Add MCP3221 support

This Patch adds support for mcp3221 chip to the
mcp3021 driver.

Signed-off-by: Sven Schuchmann <schuchmann@schleissheimer.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 6bc49cf..c74e73b 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -855,11 +855,12 @@
 	  will be called max6650.
 
 config SENSORS_MCP3021
-	tristate "Microchip MCP3021"
+	tristate "Microchip MCP3021 and compatibles"
 	depends on I2C
 	help
-	  If you say yes here you get support for the MCP3021 chip
-	  that is a A/D converter (ADC) with 10-bit resolution.
+	  If you say yes here you get support for MCP3021 and MCP3221.
+	  The MCP3021 is a A/D converter (ADC) with 10-bit and the MCP3221
+	  with 12-bit resolution.
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called mcp3021.