linux-kernel - [PATCH RFC 3/6] dt-bindings: watchdog: Add Qualcomm restart reason binding

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Message-Id: <20250408-wdt_reset_reason-v1-3-e6ec30c2c926@oss.qualcomm.com>
Date: Tue, 08 Apr 2025 14:19:53 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
Subject: [PATCH RFC 3/6] dt-bindings: watchdog: Add Qualcomm restart reason
 binding

Add a devicetree binding for the Qualcomm IPQ SOCs restart reason
information region found in the IMEM, allowing the system to identify
the cause of a restart.

Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
---
 .../bindings/watchdog/qcom,restart-reason.yaml     | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/qcom,restart-reason.yaml b/Documentation/devicetree/bindings/watchdog/qcom,restart-reason.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..babbaa70b114f9691018ed6cb10bfa78e18fad64
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/qcom,restart-reason.yaml
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/qcom,restart-reason.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm IPQ SoC restart reason location
+
+maintainers:
+  - Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
+
+description:
+  The Qualcomm IPQ SoC restart reason memory region, in IMEM, is used to
+  identify the cause of the system restart. This will be helpful to identify
+  the cause when the RAM dump collection is disabled.
+
+properties:
+  compatible:
+    const: qcom,restart-reason-info
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    imem@...0000 {
+      compatible = "qcom,ipq5424-imem", "syscon", "simple-mfd";
+      reg = <0x08600000 0x1000>;
+
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      ranges = <0 0x08600000 0x1000>;
+
+      restart-reason@7b0 {
+        compatible = "qcom,restart-reason-info";
+        reg = <0x7b0 0x4>;
+      };
+    };
+...

-- 
2.34.1