linux-kernel - [tip: timers/clocksource] dt-bindings: timer: add Andes machine timer

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Message-ID: <175325505182.1420.17805798791873450946.tip-bot2@tip-bot2>
Date: Wed, 23 Jul 2025 07:17:31 -0000
From: "tip-bot2 for Ben Zong-You Xie" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Conor Dooley <conor.dooley@...rochip.com>,
 "Ben Zong-You Xie" <ben717@...estech.com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: timers/clocksource] dt-bindings: timer: add Andes machine timer

The following commit has been merged into the timers/clocksource branch of tip:

Commit-ID:     c4a134f5af13776bc546a51b5ee68f0f48d390d8
Gitweb:        https://git.kernel.org/tip/c4a134f5af13776bc546a51b5ee68f0f48d390d8
Author:        Ben Zong-You Xie <ben717@...estech.com>
AuthorDate:    Fri, 11 Jul 2025 21:30:21 +08:00
Committer:     Daniel Lezcano <daniel.lezcano@...aro.org>
CommitterDate: Mon, 14 Jul 2025 18:17:20 +02:00

dt-bindings: timer: add Andes machine timer

Add the DT binding documentation for Andes machine timer.

The RISC-V architecture defines a machine timer that provides a real-time
counter and generates timer interrupts. Andes machiner timer (PLMT0) is
the implementation of the machine timer, and it contains memory-mapped
registers (mtime and mtimecmp). This device supports up to 32 cores.

Acked-by: Conor Dooley <conor.dooley@...rochip.com>
Signed-off-by: Ben Zong-You Xie <ben717@...estech.com>
Link: https://lore.kernel.org/r/20250711133025.2192404-6-ben717@andestech.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 Documentation/devicetree/bindings/timer/andestech,plmt0.yaml | 53 +++++++-
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/andestech,plmt0.yaml

diff --git a/Documentation/devicetree/bindings/timer/andestech,plmt0.yaml b/Documentation/devicetree/bindings/timer/andestech,plmt0.yaml
new file mode 100644
index 0000000..90b6120
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/andestech,plmt0.yaml
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/andestech,plmt0.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Andes machine-level timer
+
+description:
+  The Andes machine-level timer device (PLMT0) provides machine-level timer
+  functionality for a set of HARTs on a RISC-V platform. It has a single
+  fixed-frequency monotonic time counter (MTIME) register and a time compare
+  register (MTIMECMP) for each HART connected to the PLMT0. A timer interrupt is
+  generated if MTIME >= MTIMECMP.
+
+maintainers:
+  - Ben Zong-You Xie <ben717@...estech.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - andestech,qilai-plmt
+      - const: andestech,plmt0
+
+  reg:
+    maxItems: 1
+
+  interrupts-extended:
+    minItems: 1
+    maxItems: 32
+    description:
+      Specifies which harts are connected to the PLMT0. Each item must points
+      to a riscv,cpu-intc node, which has a riscv cpu node as parent. The
+      PLMT0 supports 1 hart up to 32 harts.
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts-extended
+
+examples:
+  - |
+    interrupt-controller@...000 {
+      compatible = "andestech,qilai-plmt", "andestech,plmt0";
+      reg = <0x100000 0x100000>;
+      interrupts-extended = <&cpu0intc 7>,
+                            <&cpu1intc 7>,
+                            <&cpu2intc 7>,
+                            <&cpu3intc 7>;
+    };