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[v4,3/5] dt-bindings: watchdog: qcom-wdt: Document qcom,imem property

Message ID 20250519-wdt_reset_reason-v4-3-d59d21275c75@oss.qualcomm.com
State New
Headers show
Series Add support to read the watchdog bootstatus from IMEM | expand

Commit Message

Kathiravan Thirumoorthy May 19, 2025, 8:34 a.m. UTC 
Document the "qcom,imem" property for the watchdog device on Qualcomm
IPQ platforms. Use this property to extract the restart reason from
IMEM, which is updated by XBL. Populate the watchdog's bootstatus sysFS
entry with this information, when the system reboots due to a watchdog
timeout.

Describe this property for the IPQ5424 watchdog device and extend support
to other targets subsequently.

Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>
---
Changes in v4:
	- New patch
---
 .../devicetree/bindings/watchdog/qcom-wdt.yaml       | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml b/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml
index 49e2b807db0bc9d3edfc93ec41ad0df0b74ed032..bbe9b68ff4c8b813744ffd86bb52303943366fa2 100644
--- a/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml
@@ -81,6 +81,16 @@  properties:
     minItems: 1
     maxItems: 5
 
+  qcom,imem:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      phandle to the IMEM syscon node that exposes the system restart reason
+    items:
+      - items:
+          - description: phandle of IMEM syscon
+          - description: offset of restart reason region
+          - description: value indicate that the watchdog timeout has occurred
+
 required:
   - compatible
   - reg
@@ -117,6 +127,16 @@  allOf:
       required:
         - clock-frequency
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,apss-wdt-ipq5424
+    then:
+      required:
+        - qcom,imem
+
 unevaluatedProperties: false
 
 examples: