[PATCH v7 3/7] dt-bindings: ptp: Add amazon,vmclock
From: Takahiro Itazuri <hidden>
Date: 2026-01-30 17:37:31
Also in:
linux-devicetree, lkml
Subsystem:
open firmware and flattened device tree bindings, ptp vmclock support, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, David Woodhouse, Linus Torvalds
From: David Woodhouse <redacted> 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 <redacted> Signed-off-by: Babis Chalios <redacted> Reviewed-by: Krzysztof Kozlowski <redacted> Tested-by: Takahiro Itazuri <redacted> --- .../bindings/ptp/amazon,vmclock.yaml | 46 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 47 insertions(+) create mode 100644 Documentation/devicetree/bindings/ptp/amazon,vmclock.yaml
diff --git a/Documentation/devicetree/bindings/ptp/amazon,vmclock.yaml b/Documentation/devicetree/bindings/ptp/amazon,vmclock.yaml
new file mode 100644
index 000000000..357790df8
--- /dev/null
+++ b/Documentation/devicetree/bindings/ptp/amazon,vmclock.yaml@@ -0,0 +1,46 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/ptp/amazon,vmclock.yaml# +$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://uapi-group.org/specifications/specs/vmclock/ + +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> + ptp@80000000 { + compatible = "amazon,vmclock"; + reg = <0x80000000 0x1000>; + interrupts = <GIC_SPI 36 IRQ_TYPE_EDGE_RISING>; + };
diff --git a/MAINTAINERS b/MAINTAINERS
index e8f06145f..171813ea7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS@@ -20728,6 +20728,7 @@ PTP VMCLOCK SUPPORT M: David Woodhouse <dwmw2@infradead.org> L: netdev@vger.kernel.org S: Maintained +F: Documentation/devicetree/bindings/ptp/amazon,vmclock.yaml F: drivers/ptp/ptp_vmclock.c F: include/uapi/linux/vmclock-abi.h
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2.50.1