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Date:   Fri, 29 Apr 2022 08:30:31 +0000
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Subject: [PATCH v4 1/2] dt-bindings: vm-wdt: Add qemu,vm-watchdog compatible
From:   Sebastian Ene <sebastianene@google.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Dragan Cvetic <dragan.cvetic@xilinx.com>
Cc:     linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        maz@kernel.org, will@kernel.org, qperret@google.com,
        Guenter Roeck <linux@roeck-us.net>,
        Sebastian Ene <sebastianene@google.com>
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Precedence: bulk

The stall detection mechanism allows to configure the expiration
duration and the internal counter clock frequency measured in Hz.
Add these properties in the schema.

Signed-off-by: Sebastian Ene <sebastianene@google.com>
---
 .../devicetree/bindings/misc/vm-watchdog.yaml | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/vm-watchdog.yaml

diff --git a/Documentation/devicetree/bindings/misc/vm-watchdog.yaml b/Documentation/devicetree/bindings/misc/vm-watchdog.yaml
new file mode 100644
index 000000000000..d7cca23357ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/vm-watchdog.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/vm-watchdog.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: VM watchdog
+
+description: |
+  This binding describes a CPU stall detector mechanism for virtual cpus
+  which is accessed through MMIO.
+
+maintainers:
+  - Sebastian Ene <sebastianene@google.com>
+
+properties:
+  compatible:
+    enum:
+      - qemu,vm-watchdog
+  clock-frequency:
+    $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
+
+additionalProperties: false
+
+examples:
+  - |
+    watchdog {
+      compatible = "qemu,vm-watchdog";
+      clock-frequency = <10>;
+      timeout-sec = <8>;
+    };
+
+...
-- 
2.36.0.464.gb9c8b46e94-goog