[PATCH v6 4/6] dt-bindings: iio: adc: ad7192: Add clock provider

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

Internal clock of AD719X devices can be made available on MCLK2 pin. Add
clock provider to support this functionality.

The clock source can be either provided externally or the internal clock
is used. Pair of clocks and clock-names property is mutally exclusive
with #clock-cells property.

Modify second example to showcase the mode where internal clock is used.

Signed-off-by: Alisa-Dariana Roman <alisa.roman@analog.com>
---
 .../devicetree/bindings/iio/adc/adi,ad7192.yaml   | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
index c3adc32684cf..384bff7e9bb7 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
@@ -42,13 +42,17 @@ properties:
     description:
       Optionally, either a crystal can be attached externally between MCLK1 and
       MCLK2 pins, or an external CMOS-compatible clock can drive the MCLK2
-      pin. If absent, internal 4.92MHz clock is used.
+      pin. If absent, internal 4.92MHz clock is used, which can be made
+      available on MCLK2 pin.
 
   clock-names:
     enum:
       - xtal
       - mclk
 
+  "#clock-cells":
+    const: 0
+
   interrupts:
     maxItems: 1
 
@@ -169,6 +173,12 @@ allOf:
       required:
         - clocks
         - clock-names
+  - oneOf:
+      - required:
+          - clocks
+          - clock-names
+      - required:
+          - "#clock-cells"
 
 unevaluatedProperties: false
 
@@ -214,8 +224,7 @@ examples:
             spi-max-frequency = <1000000>;
             spi-cpol;
             spi-cpha;
-            clocks = <&ad7192_mclk>;
-            clock-names = "mclk";
+            #clock-cells = <0>;
             interrupts = <25 0x2>;
             interrupt-parent = <&gpio>;
             aincom-supply = <&aincom>;
-- 
2.34.1