[PATCH] dt-bindings: example-schema: Show example of dependentRequired

[Krzysztof Kozlowski]

dependentRequired is shorter and preferred form of conditional property
requirement, over allOf:if:then: block, so document example usage.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/example-schema.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/example-schema.yaml b/Documentation/devicetree/bindings/example-schema.yaml
index b04f3cc4312c..0c78eda67a2e 100644
--- a/Documentation/devicetree/bindings/example-schema.yaml
+++ b/Documentation/devicetree/bindings/example-schema.yaml
@@ -217,6 +217,14 @@ required:
   - interrupts
   - interrupt-controller
 
+# Properties might be required only if some other property is present.
+# dependentRequired is a shorter and preferred way to express this, instead of
+# if:then: block.
+dependentRequired:
+  # foo-gpios is not a required property, but if present, then foo-supply must
+  # be provided as well.
+  foo-gpios: [ foo-supply ]
+
 # if/then schema can be used to handle conditions on a property affecting
 # another property. A typical case is a specific 'compatible' value changes the
 # constraints on other properties.
-- 
2.53.0