dt-bindings: clock: Add BCM63268 timer binding

Document the Broadcom BCM63268 Clock and Reset controller.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230322171515.120353-4-noltari@gmail.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/brcm,bcm63268-timer-clocks.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/brcm,bcm63268-timer-clocks.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom BCM63268 Timer Clock and Reset Device Tree Bindings
+
+maintainers:
+  - Álvaro Fernández Rojas <noltari@gmail.com>
+
+properties:
+  compatible:
+    const: brcm,bcm63268-timer-clocks
+
+  reg:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 1
+
+  "#reset-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - "#clock-cells"
+  - "#reset-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    timer_clk: clock-controller@100000ac {
+      compatible = "brcm,bcm63268-timer-clocks";
+      reg = <0x100000ac 0x4>;
+      #clock-cells = <1>;
+      #reset-cells = <1>;
+    };