Messages in this thread Patch in this message |  | | From | "Chalios, Babis" <> | | Subject | [PATCH v2 3/4] dt-bindings: clock: Add device tree bindings for vmclock | | Date | Tue, 2 Dec 2025 20:11:55 +0000 |
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From: David Woodhouse <dwmw@amazon.co.uk>
Add device tree bindings for the vmclock device, similar to the existing vmgenid bindings. The vmclock device provides a PTP clock source and precise timekeeping across live migration and snapshot/restore operations.
The bindings specify a required memory region containing the vmclock_abi structure and an optional interrupt for clock disruption notifications.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Babis Chalios <bchalios@amazon.es> --- .../bindings/clock/amazon,vmclock.yaml | 46 +++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/amazon,vmclock.yaml
diff --git a/Documentation/devicetree/bindings/clock/amazon,vmclock.yaml b/Documentation/devicetree/bindings/clock/amazon,vmclock.yaml new file mode 100644 index 000000000000..f7dfa022bf6f --- /dev/null +++ b/Documentation/devicetree/bindings/clock/amazon,vmclock.yaml @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/amazon,vmclock.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Virtual Machine Clock + +maintainers: + - David Woodhouse <dwmw2@infradead.org> + +description: + The vmclock device provides a precise clock source and allows for + accurate timekeeping across live migration and snapshot/restore + operations. The full specification of the shared data structure + is available at https://david.woodhou.se/VMClock.pdf + +properties: + compatible: + const: amazon,vmclock + + reg: + description: + Specifies the shared memory region containing the vmclock_abi structure. + maxItems: 1 + + interrupts: + description: + Interrupt used to notify when the contents of the vmclock_abi structure + have been updated. + maxItems: 1 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + vmclock@80000000 { + compatible = "amazon,vmclock"; + reg = <0x80000000 0x1000>; + interrupts = <GIC_SPI 36 IRQ_TYPE_EDGE_RISING>; + }; -- 2.34.1
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