[PATCH v3 3/3] dt-bindings: i3c: Add AST2600 I3C global registers

[Dawid Glazik]

Introduce the device-tree bindings for I3C global registers found on
AST2600 SoCs.

Signed-off-by: Dawid Glazik <dawid.glazik at linux.intel.com>
---
I wasn't sure if I should add newline at the end of the
file or not so I took
https://github.com/torvalds/linux/tree/master/Documentation/devicetree/bindings/i3c
as an example.
---
 .../i3c/aspeed,ast2600-i3c-global.yaml        | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i3c/aspeed,ast2600-i3c-global.yaml

diff --git a/Documentation/devicetree/bindings/i3c/aspeed,ast2600-i3c-global.yaml b/Documentation/devicetree/bindings/i3c/aspeed,ast2600-i3c-global.yaml
new file mode 100644
index 000000000000..edecc18796a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/i3c/aspeed,ast2600-i3c-global.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i3c/aspeed,ast2600-i3c-global.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED AST2600 I3C Global Registers
+
+description: |
+  The AST2600 SoC provides a shared I3C global register block used by all
+  I3C controller instances. This block contains per-instance global
+  configuration fields, including controller instance ID and SDA pull-up
+  configuration.
+  Each I3C controller references this syscon node through the
+  aspeed,global-regs property.
+
+maintainers:
+  - Dawid Glazik <dawid.glazik at linux.intel.com>
+
+allOf:
+  - $ref: /schemas/mfd/syscon-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: aspeed,ast2600-i3c-global
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    bus at 1e7a0000 {
+        compatible = "simple-bus";
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0 0x1e7a0000 0x8000>;
+
+        i3c-global at 0 {
+            compatible = "aspeed,ast2600-i3c-global", "syscon";
+            reg = <0x0 0x1000>;
+            resets = <&syscon ASPEED_RESET_I3C_DMA>;
+        };
+    };
+...
\ No newline at end of file
-- 
2.43.0