[PATCH v5 5/8] dt-bindings: timer: add Andes machine timer

Ben Zong-You Xie
2025-06-02T06:08:20Z

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@microchip.com>
Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
---
This patch depends on patch 2 and patch 4
---
.../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@andestech.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@100000 {
+ 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 b79cdd43fe37..57a4b3789ef8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20952,6 +20952,7 @@ M: Ben Zong-You Xie <ben717@andestech.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@sifive.com>
--
2.34.1