[PATCH v2 1/2] dt-bindings: iio: potentiometer: Add Microchip MCP41xxx/42xxx

[Chris Coffey <cmc@babblebit.net>]

This patch adds device tree documentation for the Microchip
MCP41xxx/42xxx family of digital potentiometers.

Signed-off-by: Chris Coffey <cmc@babblebit.net>
---
 .../bindings/iio/potentiometer/mcp41010.txt        | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/potentiometer/mcp41010.txt

diff --git a/Documentation/devicetree/bindings/iio/potentiometer/mcp41010.txt b/Documentation/devicetree/bindings/iio/potentiometer/mcp41010.txt
new file mode 100644
index 0000000000..17565acace
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/potentiometer/mcp41010.txt
@@ -0,0 +1,29 @@
+* Microchip MCP41010/41050/41100/42010/42050/42100 Digital Potentiometer
+  driver
+
+Datasheet publicly available at:
+http://ww1.microchip.com/downloads/en/devicedoc/11195c.pdf
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in
+
+        Documentation/devicetree/bindings/spi/spi-bus.txt
+
+must be specified.
+
+Required properties:
+	- compatible:  	Must be one of the following, depending on the
+			model:
+			"microchip,mcp41010"
+			"microchip,mcp41050"
+			"microchip,mcp41100"
+			"microchip,mcp42010"
+			"microchip,mcp42050"
+			"microchip,mcp42100"
+
+Example:
+mcp41010: potentiometer@0 {
+	compatible = "mcp41010";
+	reg = <0>;
+	spi-max-frequency = <500000>;
+};
-- 
2.11.0