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    Subject[PATCH v9 1/2] dt-bindings: vcpu_stall_detector: Add qemu,vcpu-stall-detector compatible
    From
    The VCPU stall detection mechanism allows to configure the expiration
    duration and the internal counter clock frequency measured in Hz.
    Add these properties in the schema.

    While this is a memory mapped virtual device, it is expected to be loaded
    when the DT contains the compatible: "qemu,vcpu-stall-detector" node.
    In a protected VM we trust the generated DT nodes and we don't rely on
    the host to present the hardware peripherals.

    Signed-off-by: Sebastian Ene <sebastianene@google.com>
    ---
    .../misc/qemu,vcpu-stall-detector.yaml | 51 +++++++++++++++++++
    1 file changed, 51 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml

    diff --git a/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml b/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml
    new file mode 100644
    index 000000000000..1aebeb696ee0
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml
    @@ -0,0 +1,51 @@
    +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    +%YAML 1.2
    +---
    +$id: http://devicetree.org/schemas/misc/qemu,vcpu-stall-detector.yaml#
    +$schema: http://devicetree.org/meta-schemas/core.yaml#
    +
    +title: VCPU stall detector
    +
    +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,vcpu-stall-detector
    +
    + reg:
    + maxItems: 1
    +
    + clock-frequency:
    + $ref: /schemas/types.yaml#/definitions/uint32
    + description: |
    + The internal clock of the stall detector peripheral measure in Hz used
    + to decrement its internal counter register on each tick.
    + Defaults to 10 if unset.
    + default: 10
    +
    + timeout-sec:
    + description: |
    + The stall detector expiration timeout measured in seconds.
    + Defaults to 8 if unset. Please note that it also takes into account the
    + time spent while the VCPU is not running.
    + default: 8
    +
    +required:
    + - compatible
    +
    +additionalProperties: false
    +
    +examples:
    + - |
    + vmwdt@9030000 {
    + compatible = "qemu,vcpu-stall-detector";
    + reg = <0x9030000 0x10000>;
    + clock-frequency = <10>;
    + timeout-sec = <8>;
    + };
    --
    2.37.0.rc0.161.g10f37bed90-goog
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