dt-bindings: iio: adc: ad7768-1: add new supported parts and properties

Add compatibles for supported parts in the ad7768-1 family:
	ADAQ7767-1, ADAQ7768-1 and ADAQ7769-1

Add new properties:
	adi,gain-milli and adi,sync-in-spi

Signed-off-by: Jonathan Santos <Jonathan.Santos@analog.com>

Author: jonathanns

Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml

@@ -1,21 +1,30 @@
 # SPDX-License-Identifier: GPL-2.0
+# Copyright 2024 Analog Devices Inc.
 %YAML 1.2
 ---
 $id: http://devicetree.org/schemas/iio/adc/adi,ad7768-1.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Analog Devices AD7768-1 ADC device driver
+title: Analog Devices AD7768-1 ADC family device driver
 
 maintainers:
   - Michael Hennerich <michael.hennerich@analog.com>
 
 description: |
-  Datasheet at:
-    https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
+  Analog Devices AD7768-1 24-Bit Single Channel Low Power sigma-delta ADC family
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7767-1.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7768-1.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7769-1.pdf
 
 properties:
   compatible:
-    const: adi,ad7768-1
+    enum:
+      - adi,ad7768-1
+      - adi,adaq7767-1
+      - adi,adaq7768-1
+      - adi,adaq7769-1
 
   reg:
     maxItems: 1
@@ -39,6 +48,16 @@ properties:
     description:
       ADC reference voltage supply
 
+  adi,gain-milli:
+    description: |
+      Specifies the analog anti-aliasing filter (AAF) gain applied
+      to the ADC input, in milli-units. Required for ADAQ7767-1 and
+      ADAQ7769-1 devices, the gain is determined by the pin selection
+      (IN1, IN2, IN3) on the ADAQ7767-1 or the connections of OUT_PGA
+      with IN1_AAF, IN2_AAF, or IN3_AAF on the ADAQ7769-1.
+    $ref: /schemas/types.yaml#/definitions/uint16
+    enum: [143, 364, 1000]
+
   adi,sync-in-gpios:
     maxItems: 1
     description:
@@ -47,6 +66,14 @@ properties:
       in any way, for example if the filter decimation rate changes.
       As the line is active low, it should be marked GPIO_ACTIVE_LOW.
 
+  adi,sync-in-spi:
+    description:
+      Enables synchronization of multiple devices over SPI. This property is
+      used when a signal synchronous to the base MCLK signal cannot be provided
+      via GPIO. It requires the SYNC_OUT pin to be connected to the SYNC_IN pin
+      on the ADC. In the case of multiple devices, the SYNC_OUT pin of one device
+      should be routed to the SYNC_IN pins of the other devices.
+
   reset-gpios:
     maxItems: 1
 
@@ -57,6 +84,20 @@ properties:
   "#io-channel-cells":
     const: 1
 
+allOf:
+  # Gain property only applies to ADAQ7767-1 and ADAQ7769-1 devices
+  - if:
+      properties:
+        compatible:
+          not:
+            contains:
+              enum:
+                - adi,adaq7767-1
+                - adi,adaq7769-1
+    then:
+      properties:
+        adi,gain-milli: false
+
 required:
   - compatible
   - reg
@@ -65,7 +106,21 @@ required:
   - vref-supply
   - spi-cpol
   - spi-cpha
-  - adi,sync-in-gpios
+
+allOf:
+  # adi,sync-in-gpios and adi,sync-in-spi are mutually exclusive (neither is also valid)
+  - if:
+      required:
+        - adi,sync-in-gpios
+    then:
+      properties:
+        adi,sync-in-spi: false
+  - if:
+      required:
+        - adi,sync-in-spi
+    then:
+      properties:
+        adi,sync-in-gpios: false
 
 patternProperties:
   "^channel@([0-9]|1[0-5])$":