dt-bindings: iio: dac: ti-dac082s085: Document new driver

Add device tree bindings for Texas Instruments 8/10/12-bit 2/4-channel
DAC driver.

Cc: Mathias Duckeck <m.duckeck@kunbus.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/Documentation/devicetree/bindings/iio/dac/ti-dac082s085.txt b/Documentation/devicetree/bindings/iio/dac/ti-dac082s085.txt
new file mode 100644 (file)
index 0000000..9cb0e10
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/ti-dac082s085.txt
@@ -0,0 +1,34 @@
+Texas Instruments 8/10/12-bit 2/4-channel DAC driver
+
+Required properties:
+ - compatible:         Must be one of:
+                       "ti,dac082s085"
+                       "ti,dac102s085"
+                       "ti,dac122s085"
+                       "ti,dac084s085"
+                       "ti,dac104s085"
+                       "ti,dac124s085"
+ - reg:                Chip select number.
+ - spi-cpha, spi-cpol: SPI mode (0,1) or (1,0) must be used, so specify
+                       either spi-cpha or spi-cpol (but not both).
+ - vref-supply:        Phandle to the external reference voltage supply.
+
+For other required and optional properties of SPI slave nodes please refer to
+../../spi/spi-bus.txt.
+
+Example:
+       vref_2v5_reg: regulator-vref {
+               compatible = "regulator-fixed";
+               regulator-name = "2v5";
+               regulator-min-microvolt = <2500000>;
+               regulator-max-microvolt = <2500000>;
+               regulator-always-on;
+       };
+
+       dac@0 {
+               compatible = "ti,dac082s085";
+               reg = <0>;
+               spi-max-frequency = <40000000>;
+               spi-cpol;
+               vref-supply = <&vref_2v5_reg>;
+       };