dt-bindings: iio: amplifiers: Add binding for AD8366 driver

Add device tree binding documentation for amplifiers and digital
attenuators. This covers different device variants with similar
SPI control

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>

Author: rodrigo455

Documentation/devicetree/bindings/iio/amplifiers/adi,ad8366.yaml

@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/amplifiers/adi,ad8366.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AD8366, similar Gain Amplifiers and Digital Attenuators
+
+maintainers:
+  - Michael Hennerich <michael.hennerich@analog.com>
+  - Rodrigo Alencar <rodrigo.alencar@analog.com>
+
+description: |
+  Digital Variable Gain Amplifiers (VGAs) and Digital Attenuators with
+  SPI interface.
+
+  Supported devices:
+    * AD8366 Dual-Digital Variable Gain Amplifier (VGA)
+    * ADA4961: BiCMOS RF Digital Gain Amplifier (DGA)
+    * ADL5240: Digitally controlled Variable Gain Amplifier (VGA)
+    * ADRF5720: Silicon Digital Attenuator
+    * ADRF5730: Silicon Digital Attenuator
+    * ADRF5731: Silicon Digital Attenuator
+    * HMC271A: Digital Attenuator
+    * HMC792A: GaAs MMIC Digital Attenuator
+    * HMC1018A: GaAs MMIC Digital Attenuator
+    * HMC1019A: GaAs MMIC Digital Attenuator
+    * HMC1119: Silicon Digital Attenuator
+
+properties:
+  compatible:
+    enum:
+      - adi,ad8366
+      - adi,ada4961
+      - adi,adl5240
+      - adi,adrf5720
+      - adi,adrf5730
+      - adi,adrf5731
+      - adi,hmc271a
+      - adi,hmc792a
+      - adi,hmc1018a
+      - adi,hmc1019a
+      - adi,hmc1119
+
+  reg:
+    maxItems: 1
+
+  vcc-supply:
+    description: Regulator that provides power to the device.
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      GPIO pin used to reset the device.
+
+  enable-gpios:
+    maxItems: 1
+    description:
+      GPIO pin used to enable the device.
+
+required:
+  - compatible
+  - reg
+  - vcc-supply
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      amplifier@0 {
+        compatible = "adi,ad8366";
+        reg = <0>;
+        spi-max-frequency = <1000000>;
+        vcc-supply = <&vcc_3v3>;
+      };
+    };
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      attenuator@1 {
+        compatible = "adi,adrf5730";
+        reg = <1>;
+        spi-max-frequency = <1000000>;
+        vcc-supply = <&vcc_3v3>;
+      };
+    };
+...

MAINTAINERS

@@ -1566,6 +1566,14 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/adc/adi,ad7780.yaml
 F:	drivers/iio/adc/ad7780.c
 
+ANALOG DEVICES INC AD8366 DRIVER
+M:	Michael Hennerich <Michael.Hennerich@analog.com>
+M:	Rodrigo Alencar <rodrigo.alencar@analog.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/amplifiers/adi,ad8366.yaml
+
 ANALOG DEVICES INC AD9467 DRIVER
 M:	Michael Hennerich <Michael.Hennerich@analog.com>
 M:	Nuno Sa <nuno.sa@analog.com>