linux-kernel - [PATCH v2 5/9] dt-bindings: timer: add Andes machine timer

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Message-ID: <20250503151829.605006-6-ben717@andestech.com>
Date: Sat, 3 May 2025 23:18:25 +0800
From: Ben Zong-You Xie <ben717@...estech.com>
To:
CC: <devicetree@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>, <alex@...ti.fr>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <tglx@...utronix.de>, <daniel.lezcano@...aro.org>,
        <prabhakar.mahadev-lad.rj@...renesas.com>, <tim609@...estech.com>,
        "Ben
 Zong-You Xie" <ben717@...estech.com>
Subject: [PATCH v2 5/9] 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.

Signed-off-by: Ben Zong-You Xie <ben717@...estech.com>
---
 .../bindings/timer/andestech,plmt0.yaml       | 53 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 54 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 000000000000..90b612096004
--- /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>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 856753183687..2eff000a5e17 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20814,6 +20814,7 @@ M:	Ben Zong-You Xie <ben717@...estech.com>
 S:	Maintained
 F:	Documentation/devicetree/bindings/interrupt-controller/andestech,plicsw.yaml
 F:	Documentation/devicetree/bindings/riscv/andes.yaml
+F:	Documentation/devicetree/bindings/timer/andestech,plmt0.yaml
 
 RISC-V ARCHITECTURE
 M:	Paul Walmsley <paul.walmsley@...ive.com>
-- 
2.34.1