dt-bindings: aspeed: Add Secure Boot Controller bindings

The secure boot controller was first introduced in the AST2600.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211117035106.321454-2-joel@jms.id.au
Signed-off-by: Joel Stanley <joel@jms.id.au>

diff --git a/Documentation/devicetree/bindings/arm/aspeed/aspeed,sbc.yaml b/Documentation/devicetree/bindings/arm/aspeed/aspeed,sbc.yaml
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index 0000000..c72aab7
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@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+# Copyright 2021 Joel Stanley, IBM Corp.
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/arm/aspeed/aspeed,sbc.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: ASPEED Secure Boot Controller
+
+maintainers:
+  - Joel Stanley <joel@jms.id.au>
+  - Andrew Jeffery <andrew@aj.id.au>
+
+description: |
+  The ASPEED SoCs have a register bank for interacting with the secure boot
+  controller.
+
+properties:
+  compatible:
+    items:
+      - const: aspeed,ast2600-sbc
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    sbc: secure-boot-controller@1e6f2000 {
+            compatible = "aspeed,ast2600-sbc";
+            reg = <0x1e6f2000 0x1000>;
+    };