dt-bindings: soc: qcom: Add documentation for ipcc-self-ping

Add documentation for ipcc-self-ping mechanism.

Change-Id: I2da1ff238024c701b73a3d37c8fa4cf8a42afb40
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/soc/qcom/qcom,ipcc-self-ping.yaml

@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/bindings/soc/qcom/qcom,ipcc-self-ping.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: The document describes the device tree binding for testing the IPCC
+
+maintainers:
+  - Melody Olvera <quic_molvera@quicinc.com>
+
+description: |+
+  For details on the IPCC driver, please see qcom-ipcc.yam;
+
+properties:
+  compatible:
+    items:
+      - const: qcom,ipcc-self-ping
+
+  interrupts:
+    minItems: 1
+
+  mboxes:
+    minItems: 1
+
+required:
+  - compatible
+  - interrupts
+  - mboxes
+
+additionalProperties: false
+
+example:
+  - |
+    ipcc_self_ping: ipcc-self-ping {
+	compatible = "qcom,ipcc-self-ping";
+	interrupts-extended = <&ipcc_mproc IPCC_CLIENT_APSS
+			IPCC_MPROC_SIGNAL_SMP2P IRQ_TYPE_LEVEL_HIGH>;
+	mboxes = <&ipcc_mproc IPCC_CLIENT_APSS IPCC_MPROC_SIGNAL_SMP2P>;
+    };