v4.19.13 snapshot.
diff --git a/Documentation/hwmon/mcp3021 b/Documentation/hwmon/mcp3021
new file mode 100644
index 0000000..74a6b72
--- /dev/null
+++ b/Documentation/hwmon/mcp3021
@@ -0,0 +1,29 @@
+Kernel driver MCP3021
+======================
+
+Supported chips:
+ * Microchip Technology MCP3021
+ Prefix: 'mcp3021'
+ Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/21805a.pdf
+ * Microchip Technology MCP3221
+ Prefix: 'mcp3221'
+ Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/21732c.pdf
+
+Authors:
+ Mingkai Hu
+ Sven Schuchmann <schuchmann@schleissheimer.de>
+
+Description
+-----------
+
+This driver implements support for the Microchip Technology MCP3021 and
+MCP3221 chip.
+
+The Microchip Technology Inc. MCP3021 is a successive approximation A/D
+converter (ADC) with 10-bit resolution. The MCP3221 has 12-bit resolution.
+
+These devices provide one single-ended input with very low power consumption.
+Communication to the MCP3021/MCP3221 is performed using a 2-wire I2C
+compatible interface. Standard (100 kHz) and Fast (400 kHz) I2C modes are
+available. The default I2C device address is 0x4d (contact the Microchip
+factory for additional address options).