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diff --git a/Documentation/devicetree/bindings/soc/altera/altr,sys-mgr.yaml b/Documentation/devicetree/bindings/soc/altera/altr,sys-mgr.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/altera/altr,sys-mgr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Altera SOCFPGA System Manager
+
+maintainers:
+  - Dinh Nguyen <dinguyen@kernel.org>
+
+properties:
+  compatible:
+    oneOf:
+      - description: Cyclone5/Arria5/Arria10
+        const: altr,sys-mgr
+      - description: Stratix10 SoC
+        items:
+          - const: altr,sys-mgr-s10
+          - const: altr,sys-mgr
+
+  reg:
+    maxItems: 1
+
+  cpu1-start-addr:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: CPU1 start address in hex
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: altr,sys-mgr-s10
+    then:
+      properties:
+        cpu1-start-addr: false
+
+additionalProperties: false
+
+examples:
+  - |
+    sysmgr@ffd08000 {
+      compatible = "altr,sys-mgr";
+      reg = <0xffd08000 0x1000>;
+      cpu1-start-addr = <0xffd080c4>;
+    };