dt-bindings: phy: uniphier-ahci: Add bindings for Pro4 SoC

Update AHCI-PHY binding document for UniPhier Pro4 SoC. Add a compatible
string, clock and reset lines for the SoC to the document.

Pro4 AHCI-PHY needs to control additional GIO clock line and reset lines
("pm", "tx", and "rx").

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1635503947-18250-8-git-send-email-hayashi.kunihiko@socionext.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/socionext,uniphier-ahci-phy.yaml

@@ -16,6 +16,7 @@ maintainers:
 properties:
   compatible:
     enum:
+      - socionext,uniphier-pro4-ahci-phy
       - socionext,uniphier-pxs2-ahci-phy
       - socionext,uniphier-pxs3-ahci-phy
 
@@ -26,23 +27,35 @@ properties:
     const: 0
 
   clocks:
+    minItems: 1
     maxItems: 2
 
   clock-names:
     oneOf:
       - items:          # for PXs2
           - const: link
+      - items:          # for Pro4
+          - const: link
+          - const: gio
       - items:          # for others
           - const: link
           - const: phy
 
   resets:
-    maxItems: 2
+    minItems: 2
+    maxItems: 5
 
   reset-names:
-    items:
-      - const: link
-      - const: phy
+    oneOf:
+      - items:          # for Pro4
+          - const: link
+          - const: gio
+          - const: pm
+          - const: tx
+          - const: rx
+      - items:          # for others
+          - const: link
+          - const: phy
 
 required:
   - compatible