dt-bindings: phy: qcom-edp: Add missing clock for X Elite

commit 6b99eea upstream.

On X Elite platform, the eDP PHY uses one more clock called ref.

The current X Elite devices supported upstream work fine without this
clock, because the boot firmware leaves this clock enabled. But we should
not rely on that. Also, even though this change breaks the ABI, it is
needed in order to make the driver disables this clock along with the
other ones, for a proper bring-down of the entire PHY.

So attach the this ref clock to the PHY.

Cc: stable@vger.kernel.org # v6.10
Fixes: 5d56078 ("dt-bindings: phy: qcom-edp: Add X1E80100 PHY compatibles")
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://patch.msgid.link/20251224-phy-qcom-edp-add-missing-refclk-v5-1-3f45d349b5ac@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: abelvesa

Documentation/devicetree/bindings/phy/qcom,edp-phy.yaml

@@ -37,12 +37,15 @@ properties:
       - description: PLL register block
 
   clocks:
-    maxItems: 2
+    minItems: 2
+    maxItems: 3
 
   clock-names:
+    minItems: 2
     items:
       - const: aux
       - const: cfg_ahb
+      - const: ref
 
   "#clock-cells":
     const: 1
@@ -64,6 +67,29 @@ required:
   - "#clock-cells"
   - "#phy-cells"
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          enum:
+            - qcom,x1e80100-dp-phy
+    then:
+      properties:
+        clocks:
+          minItems: 3
+          maxItems: 3
+        clock-names:
+          minItems: 3
+          maxItems: 3
+    else:
+      properties:
+        clocks:
+          minItems: 2
+          maxItems: 2
+        clock-names:
+          minItems: 2
+          maxItems: 2
+
 additionalProperties: false
 
 examples: