dt-bindings: clock: add schema for qcom,gcc-mdm9615

Add schema for the Global Clock Controller (GCC) present on the Qualcomm
MDM9615 platform.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240529-qcom-gdscs-v2-3-69c63d0ae1e7@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

Documentation/devicetree/bindings/clock/qcom,gcc-mdm9615.yaml

+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/qcom,gcc-mdm9615.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Global Clock & Reset Controller
+
+maintainers:
+  - Stephen Boyd <sboyd@kernel.org>
+  - Taniya Das <quic_tdas@quicinc.com>
+
+description: |
+  Qualcomm global clock control module provides the clocks, resets and power
+  domains.
+
+  See also::
+    include/dt-bindings/clock/qcom,gcc-mdm9615.h
+
+allOf:
+  - $ref: qcom,gcc.yaml#
+
+properties:
+  compatible:
+    enum:
+      - qcom,gcc-mdm9615
+
+  clocks:
+    items:
+      - description: CXO clock
+      - description: PLL4 from LLC
+
+  '#power-domain-cells': false
+
+required:
+  - compatible
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    clock-controller@900000 {
+      compatible = "qcom,gcc-mdm9615";
+      reg = <0x900000 0x4000>;
+      #clock-cells = <1>;
+      #reset-cells = <1>;
+      clocks = <&cxo_board>,
+               <&lcc_pll4>;
+    };
+...