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The vmclock device provides a PTP clock source and precise timekeeping across live migration and snapshot/restore operations. The binding has a required memory region containing the vmclock_abi structure and an optional interrupt for clock disruption notifications. The full spec is at https://uapi-group.org/specifications/specs/vmclock/ Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Babis Chalios <bchalios@amazon.es> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Tested-by: Takahiro Itazuri <itazur@amazon.com> Link: https://patch.msgid.link/20260130173704.12575-4-itazur@amazon.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
47 lines
1.1 KiB
YAML
47 lines
1.1 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/ptp/amazon,vmclock.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Virtual Machine Clock
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maintainers:
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- David Woodhouse <dwmw2@infradead.org>
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description:
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The vmclock device provides a precise clock source and allows for
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accurate timekeeping across live migration and snapshot/restore
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operations. The full specification of the shared data structure is
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available at https://uapi-group.org/specifications/specs/vmclock/
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properties:
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compatible:
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const: amazon,vmclock
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reg:
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description:
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Specifies the shared memory region containing the vmclock_abi structure.
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maxItems: 1
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interrupts:
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description:
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Interrupt used to notify when the contents of the vmclock_abi structure
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have been updated.
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maxItems: 1
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required:
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- compatible
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- reg
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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ptp@80000000 {
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compatible = "amazon,vmclock";
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reg = <0x80000000 0x1000>;
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interrupts = <GIC_SPI 36 IRQ_TYPE_EDGE_RISING>;
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};
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