dt-bindings: leds: Optional multi-led unit address

The unit address does not make sense in all cases the multi-led node is
used, e.g. for the upcoming PWM multi-color LED driver.

Signed-off-by: Sven Schwermer <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Pavel Machek <[email protected]>
diff --git a/Documentation/devicetree/bindings/leds/leds-class-multicolor.yaml b/Documentation/devicetree/bindings/leds/leds-class-multicolor.yaml
index 37445c6..f41d021 100644
--- a/Documentation/devicetree/bindings/leds/leds-class-multicolor.yaml
+++ b/Documentation/devicetree/bindings/leds/leds-class-multicolor.yaml
@@ -20,7 +20,7 @@
   within this documentation directory.
 
 patternProperties:
-  "^multi-led@([0-9a-f])$":
+  "^multi-led(@[0-9a-f])?$":
     type: object
     description: Represents the LEDs that are to be grouped.
     properties: