dt-bindings: clocks: add dummycc bindings

Add dummycc device bindings. These devices are used to reference
clock controllers and emulate clock operations.

Change-Id: I4f7251e6ee4475c8837375d5eea5658599f41635
Signed-off-by: Xubin Bai <quic_xubibai@quicinc.com>

bindings/clock/qcom,dummycc.yaml

@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/qcom,dummy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. Dummy Clock & Reset Controller Binding
+
+maintainers:
+   - Xubin Bai <quic_xubibai@quicinc.com>
+
+description: |
+  Dummy clock controller devices provide clock API support for
+  driver development during pre-silicon stage. The clock driver
+  always returns a dummy clock that has no effect on hardware.
+
+properties:
+  compatible:
+    const: qcom,dummycc
+
+  clock-output-names:
+    items:
+      - const: gcc_clocks
+      - const: gpucc_clocks
+      - const: dispcc_clocks
+      - const: cambistmclkcc_clocks
+      - const: camcc_clocks
+      - const: evacc_clocks
+      - const: gxclkctl_clocks
+      - const: tcsrcc_clocks
+      - const: videocc_clocks
+
+  '#clock-cells':
+    const: 1
+
+  '#reset-cells':
+    const: 1
+
+required:
+  - compatible
+  - clock-output-names
+  - '#clock-cells'
+  - '#reset-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    clock_gcc: qcom,gcc {
+      compatible = "qcom,dummycc";
+      clock-output-names = "gcc_clocks";
+      #clock-cells = <1>;
+      #reset-cells = <1>;
+    };
+...
+