[PATCH 6/7] dt-bindings: iio: adc: add adi,ad7606c-{16,18} compatible strings

[Alexandru Ardelean <aardelean@baylibre.com>]

The driver will support the AD7606C-16 and AD7606C-18.
This change adds the compatible strings for these devices.

The AD7606C-16,18 channels also support these (individually configurable)
types of channels:
 - bipolar single-ended
 - unipolar single-ended
 - bipolar differential

This DT adds support for 'channel@X' nodes'

Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com>
---
 .../bindings/iio/adc/adi,ad7606.yaml          | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
index 69408cae3db9..f9e177de3f8c 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
@@ -14,6 +14,8 @@ description: |
   https://www.analog.com/media/en/technical-documentation/data-sheets/AD7605-4.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606_7606-6_7606-4.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/AD7606B.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-16.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-18.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/AD7616.pdf
 
 properties:
@@ -24,6 +26,8 @@ properties:
       - adi,ad7606-6
       - adi,ad7606-8  # Referred to as AD7606 (without -8) in the datasheet
       - adi,ad7606b
+      - adi,ad7606c-16
+      - adi,ad7606c-18
       - adi,ad7616
 
   reg:
@@ -114,6 +118,30 @@ properties:
       assumed that the pins are hardwired to VDD.
     type: boolean
 
+patternProperties:
+  "^channel@([0-9a-f])$":
+    type: object
+    $ref: adc.yaml
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        description: The channel number.
+        minimum: 0
+        maximum: 7
+
+      diff-channel:
+        description: Channel is bipolar differential.
+        type: boolean
+
+      bipolar:
+        description: |
+          Channel is bipolar single-ended. If 'diff-channel' is set, then
+          the value of this property will be ignored.
+        type: boolean
+    required:
+      - reg
+
 required:
   - compatible
   - reg
@@ -170,6 +198,21 @@ allOf:
         adi,conversion-start-gpios:
           maxItems: 1
 
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - adi,ad7606c-16
+                - adi,ad7606c-18
+    then:
+      patternProperties:
+        "^channel@([0-9a-f])$":
+          properties:
+            diff-channels: false
+            bipolar: true
+
 unevaluatedProperties: false
 
 examples:
@@ -202,4 +245,44 @@ examples:
             standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
         };
     };
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,ad7606-8";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+            spi-cpol;
+            spi-cpha;
+
+            avcc-supply = <&adc_vref>;
+            vdrive-supply = <&vdd_supply>;
+
+            interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+            interrupt-parent = <&gpio>;
+
+            adi,conversion-start-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+
+            adi,conversion-start-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+            reset-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
+            adi,first-data-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
+            standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
+
+            adi,sw-mode;
+
+            channel@1 {
+                reg = <1>;
+                diff-channel;
+            };
+
+            channel@3 {
+                reg = <3>;
+                bipolar;
+            };
+        };
+    };
 ...
-- 
2.46.0