dt-bindings: iio: frequency: add adf4377 doc

Add device tree bindings for the ADF4377 driver.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221115110041.71495-1-antoniu.miclaus@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/frequency/adi,adf4377.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/frequency/adi,adf4377.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ADF4377 Microwave Wideband Synthesizer with Integrated VCO
+
+maintainers:
+  - Antoniu Miclaus <antoniu.miclaus@analog.com>
+  - Dragos Bogdan <dragos.bogdan@analog.com>
+
+description: |
+   The ADF4377 is a high performance, ultralow jitter, dual output integer-N
+   phased locked loop (PLL) with integrated voltage controlled oscillator (VCO)
+   ideally suited for data converter and mixed signal front end (MxFE) clock
+   applications.
+
+   https://www.analog.com/en/products/adf4377.html
+
+properties:
+  compatible:
+    enum:
+      - adi,adf4377
+      - adi,adf4378
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 10000000
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    description:
+      External clock that provides reference input frequency.
+    items:
+      - const: ref_in
+
+  chip-enable-gpios:
+    description:
+      GPIO that controls the Chip Enable Pin.
+    maxItems: 1
+
+  clk1-enable-gpios:
+    description:
+      GPIO that controls the Enable Clock 1 Output Buffer Pin.
+    maxItems: 1
+
+  clk2-enable-gpios:
+    description:
+      GPIO that controls the Enable Clock 2 Output Buffer Pin.
+    maxItems: 1
+
+  adi,muxout-select:
+    description:
+      On chip multiplexer output selection.
+      high_z - MUXOUT Pin set to high-Z.
+      lock_detect - MUXOUT Pin set to lock detector output.
+      muxout_low - MUXOUT Pin set to low.
+      f_div_rclk_2 - MUXOUT Pin set to fDIV_RCLK/2.
+      f_div_nclk_2 - MUXOUT Pin set to fDIV_NCLK/2.
+      muxout_high - MUXOUT Pin set to high.
+    enum: [high_z, lock_detect, muxout_low, f_div_rclk_2, f_div_nclk_2, muxout_high]
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        frequency@0 {
+            compatible = "adi,adf4377";
+            reg = <0>;
+            spi-max-frequency = <10000000>;
+            clocks = <&adf4377_ref_in>;
+            clock-names = "ref_in";
+        };
+    };
+...

MAINTAINERS

@@ -1206,6 +1206,14 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/amplifiers/adi,ada4250.yaml
 F:	drivers/iio/amplifiers/ada4250.c
 
+ANALOG DEVICES INC ADF4377 DRIVER
+M:	Antoniu Miclaus <antoniu.miclaus@analog.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/frequency/adi,adf4377.yaml
+F:	drivers/iio/frequency/adf4377.c
+
 ANALOG DEVICES INC ADGS1408 DRIVER
 M:	Mircea Caprioru <mircea.caprioru@analog.com>
 S:	Supported