linux-kernel - [PATCH v4 0/2] Add Realtek System Timer

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Message-ID: <20251120063010.830805-1-haowen.ting@realtek.com>
Date: Thu, 20 Nov 2025 14:30:08 +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 v4 0/2] Add Realtek System Timer

Changes v4:
PATCH 1/2
- Adjust compatible property description to match actual DTS and validate
  it with dt_binding_check.
- Refine binding documentation descriptions.

PATCH 2/2
- Reorder variable declarations.
- Remove debug prints.
- Eliminate unnecessary line breaks.
- Switch to set_next_event() callback instead of set_next_ktime().
- Remove operations that caused build error.
- Rename the struct `timer_of` instance variable for clarity.
- Tabularize struct initializers.
- Refine descriptions.
---

Changes v3:
PATCH 1/2
- Rename binding documentation to match compatible string.
- Drop redundant "binding" from commit subject.
- Add example node and description for realtek,rtd1635-systimer.

PATCH 2/2
- Add Kconfig dependency: ARCH_REALTEK || COMPILE_TEST.
---

Changes v2:
PATCH 1/2
- Add full name 'system timer' to description.
- Remove redundant commit messages.
- Clarify compatible strings for specific verified SoCs.
- Remove redundant reg and interrupts description sentences.
- Use generic node name in example.

PATCH 2/2
- Correct MAINTAINERS to alphabetical order.
- Update Kconfig: switch dependency to ARM/ARM64.
- Remove redundant pr_info output.
---

This patch series adds support for the Realtek System Timer, a 64-bit counter
that serves as a clock event device on Realtek SoCs.

Technical details:
- Implements a 64-bit timer operating at 1MHz fixed frequency.
- Supports oneshot mode and tick broadcast functionality.
- Remains active during CPU power-down states.

Testing:
- Functionality verified for tick broadcast on both RTD1625 and RTD1635 SoCs.
- Confirmed binding documentation passes yamllint, dt_binding_check, and dtbs_check.
- Driver successfully built under COMPILE_TEST.

Patch organization:
Patch 1/2: Device Tree binding documentation
Patch 2/2: Clocksource driver implementation

Best regards,
Hao-Wen Ting

Hao-Wen Ting (2):
  dt-bindings: timer: Add Realtek SYSTIMER
  clocksource: Add Realtek system timer driver

 .../timer/realtek,rtd1625-systimer.yaml       |  47 ++++++
 MAINTAINERS                                   |   5 +
 drivers/clocksource/Kconfig                   |  11 ++
 drivers/clocksource/Makefile                  |   1 +
 drivers/clocksource/timer-realtek.c           | 150 ++++++++++++++++++
 5 files changed, 214 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/realtek,rtd1625-systimer.yaml
 create mode 100644 drivers/clocksource/timer-realtek.c


base-commit: 948b99877bf5a1cd58bee930e455b7574daba5c3
-- 
2.34.1