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[60.250.196.139]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38febfd8ff8sm859815a91.4.2026.08.04.00.05.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Aug 2026 00:05:09 -0700 (PDT) From: Zi-Yu Chen To: Wim Van Sebroeck , Guenter Roeck Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jacky Huang , Shan-Chun Hung , Andrew Jeffery , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Zi-Yu Chen Subject: [PATCH v3 0/3] watchdog: ma35d1: Add support for MA35D1 Watchdog Date: Tue, 4 Aug 2026 15:03:48 +0800 Message-Id: <20260804070351.1846165-1-zychennvt@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch series introduces watchdog timer support for the Nuvoton MA35D1 SoC platform. The MA35D1 watchdog timer hardware provides a programmable countdown timer capable of triggering a system reset upon timeout expiration or generating an interrupt to wake up the system from low-power states. Key features supported in this driver: - Standard watchdog operations (start, stop, ping, set_timeout). - Boot status detection to identify watchdog reset events (WDIOF_CARDRESET). - Power management support including suspend/resume and wakeup functionality. Series breakdown: - Patch 1: Add DT binding documentation for Nuvoton MA35D1 watchdog. - Patch 2: Add the watchdog driver implementation for MA35D1. - Patch 3: Add the watchdog node in the MA35D1 SoC DeviceTree file. Testing: - Tested on the Nuvoton MA35D1 development board using standard watchdog test utilities (e.g., watchdog-test from tools/testing/selftests/watchdog). Signed-off-by: Zi-Yu Chen --- Changes in v3: - Added check for watchdog_hw_running in suspend/resume. - Add set_timeout in probe before devm_watchdog_register_device. - fix spelling mistake in Kconfig help text. - Drop redundant "binding" wording from patch 1 subject. Changes in v2: - Added `watchdog_stop_on_reboot()` and `watchdog_stop_on_unregister()`. Addressed automated review feedback (Sashiko AI) and reviewer comments: - Remove redundant 'struct device *dev' from driver private structure. - Add ma35d1_wdt_wait_sync() after writing WDTEN to REG_WDT_CTL in ma35d1_wdt_start(). - Preserve wdt_dev->timeout when requested timeout exceeds hardware maximum. - Replace dev_pm_set_wake_irq with devm_pm_set_wake_irq. - Set WDOG_HW_RUNNING if watchdog was already enabled by bootloader. - Fix IRQ variable type from u32 to int. - Removed unnecessary `select MFD_SYSCON` from Kconfig. Note: RMW operations on REG_WDT_CTL have no runtime side-effects on W1C flags as IF/WKF are only utilized during PM suspend/resume window. Zi-Yu Chen (3): dt-bindings: watchdog: Add MA35D1 Watchdog watchdog: Add Nuvoton MA35D1 watchdog driver support arm64: dts: nuvoton: Add WDT node for MA35D1 SoC .../bindings/watchdog/nuvoton,ma35d1-wdt.yaml | 55 +++ arch/arm64/boot/dts/nuvoton/ma35d1.dtsi | 7 + drivers/watchdog/Kconfig | 10 + drivers/watchdog/Makefile | 1 + drivers/watchdog/ma35d1_wdt.c | 363 ++++++++++++++++++ 5 files changed, 436 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/nuvoton,ma35d1-wdt.yaml create mode 100644 drivers/watchdog/ma35d1_wdt.c -- 2.34.1