The DWC USB3 driver and some DTS files like Exynos 5250, Keystone k2e, etc
expects the DWC USB3 DT node to have the compatible string with the
"synopsys" vendor prefix. Let's add the corresponding compatible string to
the controller DT schema, but mark it as deprecated seeing the Synopsys,
Inc. is presented with just "snps" vendor prefix.

Signed-off-by: Serge Semin <redacted>

---

Changelog v2:
- Drop quotes from around the compat string constant.

Changelog v4:
- Get the patch back, since we can't discard the deprecated prefix from the
  driver.
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 94ede43586f7..b1890558affe 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml

@@ -31,7 +31,10 @@ allOf:
 properties:
   compatible:
     contains:
-      const: snps,dwc3
+      oneOf:
+        - const: snps,dwc3
+        - const: synopsys,dwc3
+          deprecated: true
 
   interrupts:
     description:

-- 
2.29.2


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