dt-bindings: mfd: Convert aspeed,ast2400-p2a-ctrl to DT schema

Convert the aspeed,ast2x00-p2a-ctrl binding to DT schema format. The schema
is simple enough to just add it to the parent aspeed,ast2x00-scu binding.

Signed-off-by: "Rob Herring (Arm)" <[e-mail]>
Acked-by: Andrew Jeffery <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml

···
 
 patternProperties:
   '^p2a-control@[0-9a-f]+$':
-    description: See Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt
+    description: >
+      PCI-to-AHB Bridge Control
+
+      The bridge is available on platforms with the VGA enabled on the Aspeed
+      device. In this case, the host has access to a 64KiB window into all of
+      the BMC's memory. The BMC can disable this bridge. If the bridge is
+      enabled, the host has read access to all the regions of memory, however
+      the host only has read and write access depending on a register
+      controlled by the BMC.
     type: object
+    additionalProperties: false
+
+    properties:
+      compatible:
+        enum:
+          - aspeed,ast2400-p2a-ctrl
+          - aspeed,ast2500-p2a-ctrl
+      reg:
+        maxItems: 1
+
+      memory-region:
+        maxItems: 1
+        description:
+          A reserved_memory region to be used for the PCI to AHB mapping
+
+    required:
+      - compatible
+      - reg
 
   '^pinctrl(@[0-9a-f]+)?$':
     type: object
···
         #address-cells = <1>;
         #size-cells = <1>;
         ranges = <0x0 0x1e6e2000 0x1000>;
+
+        p2a-control@2c {
+            compatible = "aspeed,ast2400-p2a-ctrl";
+            reg = <0x2c 0x4>;
+        };
 
         silicon-id@7c {
             compatible = "aspeed,ast2500-silicon-id", "aspeed,silicon-id";

Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt

···
-======================================================================
-Device tree bindings for Aspeed AST2400/AST2500 PCI-to-AHB Bridge Control Driver
-======================================================================
-
-The bridge is available on platforms with the VGA enabled on the Aspeed device.
-In this case, the host has access to a 64KiB window into all of the BMC's
-memory.  The BMC can disable this bridge.  If the bridge is enabled, the host
-has read access to all the regions of memory, however the host only has read
-and write access depending on a register controlled by the BMC.
-
-Required properties:
-===================
-
- - compatible: must be one of:
-	- "aspeed,ast2400-p2a-ctrl"
-	- "aspeed,ast2500-p2a-ctrl"
-
-Optional properties:
-===================
-
-- reg: A hint for the memory regions associated with the P2A controller
-- memory-region: A phandle to a reserved_memory region to be used for the PCI
-		to AHB mapping
-
-The p2a-control node should be the child of a syscon node with the required
-property:
-
-- compatible : Should be one of the following:
-		"aspeed,ast2400-scu", "syscon", "simple-mfd"
-		"aspeed,ast2500-scu", "syscon", "simple-mfd"
-
-Example
-===================
-
-g4 Example
-----------
-
-syscon: scu@1e6e2000 {
-	compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd";
-	reg = <0x1e6e2000 0x1a8>;
-
-	p2a: p2a-control {
-		compatible = "aspeed,ast2400-p2a-ctrl";
-		memory-region = <&reserved_memory>;
-	};
-};