[PATCH 1/2] dt-bindings: iio: dac: Add docs for AD5770R DAC

[Mircea Caprioru <mircea.caprioru@analog.com>]

Adding dt-bindings documentation for AD5770R DAC. The bindings follow the
standard SPI and fixed regulator bindings.

Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
---
 .../devicetree/bindings/iio/dac/ad5770r.txt   | 86 +++++++++++++++++++
 MAINTAINERS                                   |  7 ++
 2 files changed, 93 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/dac/ad5770r.txt

diff --git a/Documentation/devicetree/bindings/iio/dac/ad5770r.txt b/Documentation/devicetree/bindings/iio/dac/ad5770r.txt
new file mode 100644
index 000000000000..bdd6ee4d5f2f
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/ad5770r.txt
@@ -0,0 +1,86 @@
+Analog Devices AD5770R DAC device driver
+
+Required properties for the AD5770R:
+	- compatible: Must be "adi,ad5770r"
+	- reg: SPI chip select number for the device
+	- spi-max-frequency: Max SPI frequency to use (< 10000000, as per
+			Documentation/devicetree/bindings/spi/spi-bus.txt)
+	- child nodes: Each child node represents one channel and has
+		the following required properties:
+		* num: This represents the channel num
+		* adi,range-microamp: Output range of the channel
+		The following ranges are supported:
+		* Channel 0:
+			* <0 300000> 0 mA to 300 mA
+			* <(-60000) 0> -60 to 0 mA
+			* <(-60000) 300000> -60 to 300 mA
+		* Channel 1:
+			* <0 140000> 0 to 140 mA
+			* <0 250000> 0 to 250 mA
+		* Channel 2:
+			* <0 55000> 0 to 55 mA
+			* <0 150000> 0 to 150 mA
+		* Channel 3 to Channel 5:
+			* <0 45000> 0 to 45 mA
+			* <0 100000> 0 to 100 mA
+
+Optional properties:
+
+- vref: Specify the voltage of the external reference used.
+		Available reference options are: 1.25 V or 2.5 V. If no
+		external reference declared then the device will use the
+		internal reference of 1.25 V.
+
+- reset-gpios: GPIO spec for the RESET pin. If specified, it will be
+		asserted during driver probe.
+
+AD5770R Example:
+
+	ad5770r@0 {
+		compatible = "ad5770r";
+		reg = <0>;
+                spi-max-frequency = <1000000>;
+		vref-supply = <&vref>;
+
+		reset-gpios = <&gpio 22 0>;
+
+		channel@0 {
+			num = <0>;
+			adi,range-microamp = <0 300000>;
+		};
+
+		channel@1 {
+			num = <1>;
+			adi,range-microamp = <0 140000>;
+		};
+
+		channel@2 {
+			num = <2>;
+			adi,range-microamp = <0 55000>;
+		};
+
+		channel@3 {
+			num = <3>;
+			adi,range-microamp = <0 45000>;
+		};
+
+		channel@4 {
+			num = <4>;
+			adi,range-microamp = <0 45000>;
+		};
+
+		channel@5 {
+			num = <5>;
+			adi,range-microamp = <0 45000>;
+		};
+       };
+
+External reference example:
+
+	vref: fixedregulator@0 {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-supply";
+		regulator-min-microvolt = <1250000>;
+		regulator-max-microvolt = <1250000>;
+	};
+
diff --git a/MAINTAINERS b/MAINTAINERS
index 6f7721d1634c..9c2626079592 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -756,6 +756,13 @@ M:	Michael Hanselmann <linux-kernel@hansmi.ch>
 S:	Supported
 F:	drivers/macintosh/ams/
 
+ANALOG DEVICES INC AD5770R DRIVER
+M:	Mircea Caprioru <mircea.caprioru@analog.com>
+L:	linux-iio@vger.kernel.org
+W:	http://ez.analog.com/community/linux-device-drivers
+S:	Supported
+F:	Documentation/devicetree/bindings/iio/dac/ad5770r.txt
+
 ANALOG DEVICES INC AD9389B DRIVER
 M:	Hans Verkuil <hans.verkuil@cisco.com>
 L:	linux-media@vger.kernel.org
-- 
2.17.1