linux-kernel - [PATCH RFC 4/6] dt-bindings: sram: qcom,imem: add the support for restart reason

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Message-Id: <20250408-wdt_reset_reason-v1-4-e6ec30c2c926@oss.qualcomm.com>
Date: Tue, 08 Apr 2025 14:19:54 +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 4/6] dt-bindings: sram: qcom,imem: add the support for
 restart reason

In the Qualcomm IPQ SoCs, system restart reason is captured in the IMEM
location by bootloaders and Linux populates this information to the
userspace. Add a child node for the restart reason in the IMEM region.

Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
---
 .../devicetree/bindings/sram/qcom,imem.yaml        | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/sram/qcom,imem.yaml b/Documentation/devicetree/bindings/sram/qcom,imem.yaml
index dec1b1ee924cf1386f559eb262ea864f2788c165..c3dab5fbc88c1515bfb3585f18aed9e01ae36fe4 100644
--- a/Documentation/devicetree/bindings/sram/qcom,imem.yaml
+++ b/Documentation/devicetree/bindings/sram/qcom,imem.yaml
@@ -56,6 +56,10 @@ patternProperties:
     $ref: /schemas/remoteproc/qcom,pil-info.yaml#
     description: Peripheral image loader relocation region
 
+  "^restart-reason@[0-9a-f]+$":
+    $ref: /schemas/watchdog/qcom,restart-reason.yaml#
+    description: IPQ SoC restart reason region
+
 required:
   - compatible
   - reg
@@ -82,3 +86,23 @@ examples:
             };
         };
     };
+
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        sram@...0000 {
+            compatible = "qcom,ipq5424-imem", "syscon", "simple-mfd";
+            reg = <0 0x08600000 0 0x1000>;
+            ranges = <0 0 0x08600000 0x1000>;
+
+            #address-cells = <1>;
+            #size-cells = <1>;
+
+            restart-reason@7b0 {
+                compatible = "qcom,restart-reason-info";
+                reg = <0x7b0 0x4>;
+            };
+        };
+    };

-- 
2.34.1