staging: iio: ad7780: add device tree binding

Adds a device tree binding for the ad7780 driver.

Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7780.txt b/Documentation/devicetree/bindings/iio/adc/adi,ad7780.txt
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+* Analog Devices AD7170/AD7171/AD7780/AD7781
+
+Data sheets:
+
+- AD7170:
+       * https://www.analog.com/media/en/technical-documentation/data-sheets/AD7170.pdf
+- AD7171:
+       * https://www.analog.com/media/en/technical-documentation/data-sheets/AD7171.pdf
+- AD7780:
+       * https://www.analog.com/media/en/technical-documentation/data-sheets/ad7780.pdf
+- AD7781:
+       * https://www.analog.com/media/en/technical-documentation/data-sheets/AD7781.pdf
+
+Required properties:
+
+- compatible: should be one of
+       * "adi,ad7170"
+       * "adi,ad7171"
+       * "adi,ad7780"
+       * "adi,ad7781"
+- reg: spi chip select number for the device
+- vref-supply: the regulator supply for the ADC reference voltage
+
+Optional properties:
+
+- powerdown-gpios:  must be the device tree identifier of the PDRST pin. If
+                   specified, it will be asserted during driver probe. As the
+                   line is active high, it should be marked GPIO_ACTIVE_HIGH.
+- adi,gain-gpios:   must be the device tree identifier of the GAIN pin. Only for
+                   the ad778x chips. If specified, it will be asserted during
+                   driver probe. As the line is active low, it should be marked
+                   GPIO_ACTIVE_LOW.
+- adi,filter-gpios: must be the device tree identifier of the FILTER pin. Only
+                   for the ad778x chips. If specified, it will be asserted
+                   during driver probe. As the line is active low, it should be
+                   marked GPIO_ACTIVE_LOW.
+
+Example:
+
+adc@0 {
+       compatible =  "adi,ad7780";
+       reg =         <0>;
+       vref-supply = <&vdd_supply>
+
+       powerdown-gpios  = <&gpio 12 GPIO_ACTIVE_HIGH>;
+       adi,gain-gpios   = <&gpio  5 GPIO_ACTIVE_LOW>;
+       adi,filter-gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+};