[PATCH] dt-bindings: usb: snps,dwc3: document extcon property

[Krzysztof Kozlowski]

The DWC3 USB Linux driver and several DTS use extcon property, so
document it, even though it is deprecated, to fix warnings like:

  sm6125-sony-xperia-seine-pdx201.dtb: usb@4ef8800: usb@4e00000: Unevaluated properties are not allowed ('extcon' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index be36956af53b..cad2efd5f8c9 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -70,6 +70,10 @@ properties:
 
   dma-coherent: true
 
+  extcon:
+    maxItems: 1
+    deprecated: true
+
   iommus:
     maxItems: 1
 
-- 
2.34.1