dt-bindings: phy: describe the Qualcomm SGMII PHY

Describe the SGMII/SerDes PHY present on the qcs8300 platforms. Since
qcs8300 shares the same SerDes as sa8775p, so it fallback to the
compatible.

Signed-off-by: Yijie Yang <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: yijiyang

Documentation/devicetree/bindings/phy/qcom,sa8775p-dwmac-sgmii-phy.yaml

@@ -15,7 +15,12 @@ description:
 
 properties:
   compatible:
-    const: qcom,sa8775p-dwmac-sgmii-phy
+    oneOf:
+      - items:
+          - enum:
+              - qcom,qcs8300-dwmac-sgmii-phy
+          - const: qcom,sa8775p-dwmac-sgmii-phy
+      - const: qcom,sa8775p-dwmac-sgmii-phy
 
   reg:
     items: