[PATCH v2 3/4] dt-bindings: iio: adc: ad7192: Add AD7194 support

[Alisa-Dariana Roman <alisadariana@gmail.com>]

Unlike the other AD719Xs, AD7194 has configurable differential
channels. The default configuration for these channels can be changed
from the devicetree.

Also add an example for AD7194 devicetree.

Signed-off-by: Alisa-Dariana Roman <alisa.roman@analog.com>
---
 .../bindings/iio/adc/adi,ad7192.yaml          | 74 +++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
index 9b59d6eea368..800b396f5993 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
@@ -21,6 +21,7 @@ properties:
       - adi,ad7190
       - adi,ad7192
       - adi,ad7193
+      - adi,ad7194
       - adi,ad7195
 
   reg:
@@ -108,6 +109,42 @@ required:
 
 allOf:
   - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - if:
+      properties:
+        compatible:
+          const: adi,ad7194
+    then:
+      properties:
+        '#address-cells':
+          const: 1
+
+        '#size-cells':
+          const: 0
+
+      patternProperties:
+        "^channel@([0-7a-f])$":
+          type: object
+          $ref: adc.yaml
+          unevaluatedProperties: false
+
+          properties:
+            reg:
+              description: The channel index.
+              minimum: 0
+              maximum: 7
+
+            diff-channels:
+              description: |
+                The differential channel pair for Ad7194 configurable channels. The
+                first channel is the positive input, the second channel is the
+                negative input.
+              items:
+                minimum: 1
+                maximum: 16
+
+          required:
+            - reg
+            - diff-channels
 
 unevaluatedProperties: false
 
@@ -137,3 +174,40 @@ examples:
             adi,burnout-currents-enable;
         };
     };
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            compatible = "adi,ad7194";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+            spi-cpol;
+            spi-cpha;
+            clocks = <&ad7192_mclk>;
+            clock-names = "mclk";
+            interrupts = <25 0x2>;
+            interrupt-parent = <&gpio>;
+            dvdd-supply = <&dvdd>;
+            avdd-supply = <&avdd>;
+            vref-supply = <&vref>;
+
+            adi,refin2-pins-enable;
+            adi,rejection-60-Hz-enable;
+            adi,buffer-enable;
+            adi,burnout-currents-enable;
+
+            channel@0 {
+                reg = <0>;
+                diff-channels = <1 6>;
+            };
+
+            channel@1 {
+                reg = <1>;
+                diff-channels = <2 3>;
+            };
+        };
+    };
-- 
2.34.1