[PATCH 2/3] Documentation: dt: iio: add mcp4725/6 dac device binding

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+Microchpip mcp4725 and mcp4726 DAC device driver
+
+Required properties:
+	- compatible: Must be "microchip,mcp4725" or "microchip,mcp4726"
+	- reg: Should contain the DAC I2C address
+	- vref-millivolt: Value of the reference voltage
+
+Optional properties:
+	- vref-mode: Reference voltage selection. It is available only on
+	  mcp4726. Valid values are:
+		- 0, 1: Vdd pin voltage (unbuffered)
+		- 2: Vref pin voltage unbuffered
+		- 3: Vref pin voltage internally buffered
+
+Examples:
+
+        mcp4725@60 {
+                compatible = "microchip,mcp4725";
+                reg = <0x60>;
+                vref-millivolt = <3300>;
+        };
+
+        mcp4726@60 {
+                compatible = "microchip,mcp4726";
+                reg = <0x60>;
+                vref-mode = <2>;
+                vref-millivolt = <2500>;
+        };