linux-kernel - [PATCH v7 3/7] dt-bindings: ptp: Add amazon,vmclock

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Message-ID: <20260130173704.12575-4-itazur@amazon.com>
Date: Fri, 30 Jan 2026 17:36:02 +0000
From: Takahiro Itazuri <itazur@...zon.com>
To: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>
CC: <devicetree@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Babis Chalios <mail@...alios.io>, "Alexander
 Graf" <graf@...zon.de>, <mzxreary@...inter.de>, Marco Cali
	<xmarcalx@...zon.co.uk>, David Woodhouse <dwmw@...zon.co.uk>, "Takahiro
 Itazuri" <itazur@...zon.com>
Subject: [PATCH v7 3/7] dt-bindings: ptp: Add amazon,vmclock

From: David Woodhouse <dwmw@...zon.co.uk>

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@...zon.co.uk>
Signed-off-by: Babis Chalios <bchalios@...zon.es>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Tested-by: Takahiro Itazuri <itazur@...zon.com>
---
 .../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@...radead.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@...00000 {
+      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@...radead.org>
 L:	netdev@...r.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
 
-- 
2.50.1