dt-bindings: power: reset: Add documentation for reboot reason

Document the bindings for the reboot reason driver.

Change-Id: I30dacc4f2c9ca59ed12dc94eb81b5ef39a27d187
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/power/reset/qcom,reboot-reason.yaml

@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/power/reset/qcom-reboot-reason.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Qualcomm Technologies, Inc. Reboot Reason
+
+maintainers:
+  - Elliot Berman <quic_eberman@quicinc.com>
+
+description: |
+  Qualcomm Technologies, Inc. SoCs support booting to special download
+  modes after a restart. These modes could be a :wnormal restart,
+  restarting into a ramdump collection mode (CrashDump), or restarting
+  into "emergency download mode".
+
+properties:
+  compatible:
+    items:
+      - const: qcom,reboot-mode
+
+  allOf:
+    - $ref: /schemas/nvmem/nvmem-consumer.yaml#/properties
+    - items:
+      nvmem-cell-names:
+        items:
+          - const: restart_reason
+
+required:
+  - compatible
+  - nvmem-cells-names
+
+dependencies:
+  allOf:
+    - $ref: /schemas/nvmem/nvmem-consumer.yaml#/dependencies
+
+
+examples:
+  - |
+    reboot-reason {
+      compatible = "qcom,reboot-reason";
+      nvmem-cells = <&restart_reason>;
+      nvmem-cell-names = "restart_reason";
+    };