dt-bindings: fpga: altr,socfpga-fpga-mgr: convert to DT schema

Convert the Altera SoCFPGA FPGA Manager bindings from text
format to YAML schema.

Signed-off-by: Manish Baing <manishbaing2789@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20260512182033.66222-1-manishbaing2789@gmail.com
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>

Documentation/devicetree/bindings/fpga/altera-socfpga-fpga-mgr.txt

@@ -1,17 +0,0 @@
-Altera SOCFPGA FPGA Manager
-
-Required properties:
-- compatible : should contain "altr,socfpga-fpga-mgr"
-- reg        : base address and size for memory mapped io.
-               - The first index is for FPGA manager register access.
-               - The second index is for writing FPGA configuration data.
-- interrupts : interrupt for the FPGA Manager device.
-
-Example:
-
-	hps_0_fpgamgr: fpgamgr@ff706000 {
-		compatible = "altr,socfpga-fpga-mgr";
-		reg = <0xFF706000 0x1000
-		       0xFFB90000 0x1000>;
-		interrupts = <0 175 4>;
-	};

Documentation/devicetree/bindings/fpga/altr,socfpga-fpga-mgr.yaml

@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fpga/altr,socfpga-fpga-mgr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Altera SOCFPGA FPGA Manager
+
+maintainers:
+  - Steffen Trumtrar <s.trumtrar@pengutronix.de>
+
+properties:
+  compatible:
+    const: altr,socfpga-fpga-mgr
+
+  reg:
+    items:
+      - description: FPGA manager register access
+      - description: Writing FPGA configuration data
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    fpgamgr@ff706000 {
+        compatible = "altr,socfpga-fpga-mgr";
+        reg = <0xff706000 0x1000>,
+              <0xffb90000 0x1000>;
+        interrupts = <0 175 4>;
+    };