[PATCH] dt-bindings: usb: dwc2: Add otg-rev property documentation

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Copy the otg-rev property documentation from usb-drd.yaml into the DWC2
binding document, since some users of the DWC2 IP like STM32MP1 use the
otg-rev property in DT bindings for this controller.

Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
---
NOTE: Shouldn't this somehow be part of the USB core bindings instead?
---
 Documentation/devicetree/bindings/usb/dwc2.yaml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc2.yaml b/Documentation/devicetree/bindings/usb/dwc2.yaml
index 10c7d9b6cc53f..254436c19870b 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.yaml
+++ b/Documentation/devicetree/bindings/usb/dwc2.yaml
@@ -120,6 +120,16 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     description: size of periodic tx fifo per endpoint (except ep0) in gadget mode.
 
+  otg-rev:
+    description:
+      Tells usb driver the release number of the OTG and EH supplement with
+      which the device and its descriptors are compliant, in binary-coded
+      decimal (i.e. 2.0 is 0200H). This property is used if any real OTG
+      features (HNP/SRP/ADP) is enabled. If ADP is required, otg-rev should be
+      0x0200 or above.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0x0100, 0x0120, 0x0130, 0x0200]
+
   snps,need-phy-for-wake:
     $ref: /schemas/types.yaml#/definitions/flag
     description: If present indicates that the phy needs to be left on for 
-- 
2.33.0




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