linux-kernel - [PATCH v2 1/2] dt-bindings: timer: Add Realtek SYSTIMER binding

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Message-ID: <20251114090448.285685-2-haowen.ting@realtek.com>
Date: Fri, 14 Nov 2025 17:04:47 +0800
From: Hao-Wen Ting <haowen.ting@...ltek.com>
To: <daniel.lezcano@...aro.org>, <tglx@...utronix.de>
CC: <jinn.cheng@...ltek.com>, <edwardwu@...ltek.com>, <phelic@...ltek.com>,
        <shawn.huang724@...ltek.com>, <haowen.ting@...ltek.com>,
        <cy.huang@...ltek.com>, <james.tai@...ltek.com>, <cylee12@...ltek.com>,
        <phinex@...ltek.com>, <conor+dt@...nel.org>, <krzk+dt@...nel.org>,
        <robh@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stanley_chang@...ltek.com>
Subject: [PATCH v2 1/2] dt-bindings: timer: Add Realtek SYSTIMER binding

Add device tree binding documentation for the Realtek SYSTIMER, a 64-bit
timer that can be used as a tick broadcast timer on multi-core Realtek
SoCs.

The SYSTIMER remains active during deep CPU idle states where local
timers are powered off, allowing all CPUs to enter power-cut idle states
simultaneously for improved power efficiency. The timer operates at a
fixed 1MHz frequency and supports oneshot mode for tick broadcast
functionality.

Signed-off-by: Hao-Wen Ting <haowen.ting@...ltek.com>
---
 .../bindings/timer/realtek,systimer.yaml      | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/realtek,systimer.yaml

diff --git a/Documentation/devicetree/bindings/timer/realtek,systimer.yaml b/Documentation/devicetree/bindings/timer/realtek,systimer.yaml
new file mode 100644
index 000000000000..8e68158c68f8
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/realtek,systimer.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/realtek,systimer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Realtek System Timer
+
+maintainers:
+  - Hao-Wen Ting <haowen.ting@...ltek.com>
+
+description: |
+  The Realtek SYSTIMER (System Timer) is a 64-bit timer that can be used as
+  a tick broadcast timer on multi-core Realtek SoCs. It remains active during
+  deep CPU idle states where local timers are powered off, allowing all CPUs
+  to enter power-cut idle states simultaneously for better power efficiency.
+
+  The timer operates at a fixed 1MHz frequency and supports oneshot mode
+  for tick broadcast functionality.
+
+properties:
+  compatible:
+    enum:
+      - realtek,rtd1625-systimer
+      - realtek,rtd1635-systimer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    timer@...20 {
+        compatible = "realtek,rtd1625-systimer";
+        reg = <0x89420 0x18>;
+        interrupts = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
+    };
-- 
2.34.1