dt-bindings: clock: Convert cirrus,ep7209-clk to DT schema

Convert the Cirrus EP7xxx (aka CLPS711x) binding to DT schema format.
It's a straight forward conversion.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250521004923.1795927-1-robh@kernel.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: robherring

Documentation/devicetree/bindings/clock/cirrus,ep7209-clk.yaml

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/cirrus,ep7209-clk.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cirrus Logic CLPS711X Clock Controller
+
+maintainers:
+  - Alexander Shiyan <shc_work@mail.ru>
+
+description:
+  See include/dt-bindings/clock/clps711x-clock.h for the full list of CLPS711X
+  clock IDs.
+
+properties:
+  compatible:
+    items:
+      - const: cirrus,ep7312-clk
+      - const: cirrus,ep7209-clk
+
+  reg:
+    maxItems: 1
+
+  startup-frequency:
+    description: Factory set CPU startup frequency in HZ.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  "#clock-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - startup-frequency
+  - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller@80000000 {
+        compatible = "cirrus,ep7312-clk", "cirrus,ep7209-clk";
+        reg = <0x80000000 0xc000>;
+        #clock-cells = <1>;
+        startup-frequency = <73728000>;
+    };