linux-kernel - [PATCH v3 3/4] dt-bindings: ptp: Add amazon,vmclock

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Message-ID: <20251203123539.7292-4-bchalios@amazon.es>
Date: Wed, 3 Dec 2025 12:36:15 +0000
From: "Chalios, Babis" <bchalios@...zon.es>
To: "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"richardcochran@...il.com" <richardcochran@...il.com>, "dwmw2@...radead.org"
	<dwmw2@...radead.org>, "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>,
	"davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>
CC: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Chalios,
 Babis" <bchalios@...zon.es>, "Graf (AWS), Alexander" <graf@...zon.de>,
	"mzxreary@...inter.de" <mzxreary@...inter.de>, "Cali, Marco"
	<xmarcalx@...zon.co.uk>, "Woodhouse, David" <dwmw@...zon.co.uk>
Subject: [PATCH v3 3/4] 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 specification is at https://david.woodhou.se/VMClock.pdf

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Babis Chalios <bchalios@...zon.es>
---
 .../bindings/ptp/amazon,vmclock.yaml          | 46 +++++++++++++++++++
 1 file changed, 46 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 000000000000..b98fee20ce5f
--- /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://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>
+    ptp@...00000 {
+      compatible = "amazon,vmclock";
+      reg = <0x80000000 0x1000>;
+      interrupts = <GIC_SPI 36 IRQ_TYPE_EDGE_RISING>;
+    };
-- 
2.34.1