linux-kernel - [PATCH 1/2] dt-bindings: watchdog: Add qemu,vm-watchdog compatible

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Message-Id: <20220405141954.1489782-2-sebastianene@google.com>
Date:   Tue,  5 Apr 2022 14:19:54 +0000
From:   Sebastian Ene <sebastianene@...gle.com>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-watchdog@...r.kernel.org, will@...nel.org,
        qperret@...gle.com, maz@...nel.org,
        Sebastian Ene <sebastianene@...gle.com>
Subject: [PATCH 1/2] dt-bindings: watchdog: Add qemu,vm-watchdog compatible

This watchdog can be used to detect stalls on vCPUs.

Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
---
 .../devicetree/bindings/watchdog/vm-wdt.yaml  | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/vm-wdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/vm-wdt.yaml b/Documentation/devicetree/bindings/watchdog/vm-wdt.yaml
new file mode 100644
index 000000000000..5365c963a7f6
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/vm-wdt.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/vm-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: VM watchdog
+
+allOf:
+  - $ref: "watchdog.yaml#"
+
+maintainers:
+  - Sebastian Ene <sebastianene@...gle.com>
+
+properties:
+  compatible:
+    enum:
+      - qemu,vm-watchdog
+  clock:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      The watchdog internal clock measure in Hz used to decrement the
+      watchdog counter register on each tick.
+      Defaults to 10 if unset.
+  timeout-sec:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      The watchdog expiration timeout measured in seconds.
+      Defaults to 8 if unset.
+
+required:
+  - compatible
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    watchdog {
+      compatible = "qemu,vm-watchdog";
+      clock = <10>;
+      timeout-sec = <8>;
+    };
+
+...
-- 
2.35.1.1094.g7c7d902a7c-goog