kernel/linux.git/drivers/watchdog, branch v7.2-rc1

Merge tag 'watchdog-for-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

2026-06-16T02:34:24+00:00

Pull watchdog updates and fixes from Guenter Roeck: "Subsystem: - Unregister PM notifier on watchdog unregister - Various documentation fixes and improvements Removed drivers: - Remove AMD Elan SC520 processor watchdog driver - Drop SMARC-sAM67 support - Remove driver for integrated WDT of ZFx86 486-based SoC New drivers: - Driver for Andes ATCWDT200 - Driver for Gunyah Watchdog Added support to existing drivers: - Add "apple,t8103-wdt" and "apple,t8122-wdt" compatibles to Apple watchdog driver - Add rockchip,rk3528-wdt and rockchip,rv1103b-wdt to snps,dw-wdt.yaml - Document IPQ9650, IPQ5210, Shikra, Nord, and Hawi in qcom-wdt.yaml Also document sram property and add support to get the bootstatus to qcom wdt driver - lenovo_se10_wdt: Fix use-after-rfree and add support for SE10 Gen 2 platform - ti,rti-wdt: Add ti,am62l-rti-wdt compatible - renesas: Document RZ/G3L support and rework example for renesas,r9a09g057-wdt Other bug fixes and improvements: - Use named initializers (sc1200, ziirave_wdt) - Allow pic32-dmt and pic32-wdt to be built with COMPILE_TEST - realtek-otto: enable clock before using I/O, and prevent PHASE2 underflows - rti_wdt: Add reaction control - renesas,rzn1-wdt: Drop interrupt support and other cleanup - gpio_wdt: Add ACPI support - imx7ulp_wdt: Keep WDOG running until A55 enters WFI on i.MX94 - sprd_wdt: Remove redundant sprd_wdt_disable() on register failure - bcm2835_wdt: Switch to new sys-off handler API - sama5d4_wdt: Fix WDDIS detection on SAM9X60 and SAMA7G5 - hpwdt: Refine hpwdt message for UV platform - Convert TS-4800 bindings to DT schema - menz069_wdt: drop unneeded MODULE_ALIAS - sp5100_tco: Use EFCH MMIO for newer Hygon FCH" * tag 'watchdog-for-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: (58 commits) watchdog: sc1200: Drop unused assignment of pnp_device_id driver data watchdog: unregister PM notifier on watchdog unregister dt-bindings: watchdog: qcom-wdt: Document IPQ5210 watchdog watchdog: dev: convert to kernel-doc comments watchdog: core: clean up some comments watchdog: uapi: add comments for what bit masks apply to watchdog: linux/watchdog.h: repair kernel-doc comments watchdog: add devm_watchdog_register_device() to watchdog-kernel-api watchdog: ziirave_wdt: Use named initializers for struct i2c_device_id watchdog: realtek-otto: enable clock before using I/O watchdog: realtek-otto: prevent PHASE2 underflows dt-bindings: watchdog: qcom-wdt: Document IPQ9650 watchdog dt-bindings: watchdog: renesas,rzn1-wdt: interrupts are not required dt-bindings: watchdog: apple,wdt: Add t8122 compatible watchdog: apple: Add "apple,t8103-wdt" compatible watchdog: rzn1: remove now obsolete interrupt support dt-bindings: watchdog: Add watchdog compatible for RK3528 watchdog: convert the Kconfig dependency on OF_GPIO to OF watchdog: Remove AMD Elan SC520 processor watchdog driver watchdog: lenovo_se10_wdt: Fix use-after-free and resource leak risk ...

watchdog: sc1200: Drop unused assignment of pnp_device_id driver data

2026-06-10T13:09:45+00:00

The driver explicitly sets the .driver_data member of struct pnp_device_id to zero without relying on that value. Drop this unused assignments. While touching this array simplify the list terminator. This patch doesn't modify the compiled array, only its representation in source form benefits. The former was confirmed with builds on x86 and arm64. Signed-off-by: Uwe Kleine-König (The Capable Hub) Link: https://lore.kernel.org/r/0793f81a854f9e5880ad38f54c8583b3d56e5d60.1781081216.git.u.kleine-koenig@baylibre.com Signed-off-by: Guenter Roeck

watchdog: unregister PM notifier on watchdog unregister

2026-06-08T18:57:23+00:00

watchdog_register_device() registers wdd->pm_nb when WDOG_NO_PING_ON_SUSPEND is set, but watchdog_unregister_device() does not remove it. This leaves an embedded notifier block on the PM notifier chain after the watchdog device has been unregistered. A later suspend/resume notification can then call watchdog_pm_notifier() with a stale watchdog_device pointer, or at minimum after wdd->wd_data has been cleared by watchdog_dev_unregister(). Unregister the PM notifier before tearing down the watchdog device. Fixes: 60bcd91aafd2 ("watchdog: introduce watchdog_dev_suspend/resume") Signed-off-by: Yuho Choi Link: https://lore.kernel.org/r/20260601192005.1970805-1-dbgh9129@gmail.com Signed-off-by: Guenter Roeck

watchdog: dev: convert to kernel-doc comments

2026-06-08T18:53:18+00:00

Convert multiple functions to kernel-doc format. Signed-off-by: Randy Dunlap Signed-off-by: Guenter Roeck

watchdog: core: clean up some comments

2026-06-08T18:53:18+00:00

Fix some grammar typos and bulleted kernel-doc comment format. Signed-off-by: Randy Dunlap Signed-off-by: Guenter Roeck

watchdog: ziirave_wdt: Use named initializers for struct i2c_device_id

2026-05-18T22:10:36+00:00

While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) Link: https://lore.kernel.org/r/20260518171901.904094-2-u.kleine-koenig@baylibre.com Signed-off-by: Guenter Roeck

watchdog: realtek-otto: enable clock before using I/O

2026-05-16T17:37:57+00:00

As the watchdog is normally on the same bus as the UART peripheral, the bootloader will have ensured the bus' clock is up and running before the watchdog driver is probed. Nevertheless, let's do things the right way and enable the watchdog's clock before performing I/O accesses. Signed-off-by: Sander Vanheule Link: https://lore.kernel.org/r/20260515212351.752054-3-sander@svanheule.net Signed-off-by: Guenter Roeck

watchdog: realtek-otto: prevent PHASE2 underflows

2026-05-16T17:36:34+00:00

For small pretimeout values, ((timeout - pretimeout) / tick) might be rounded up to the same value as (timeout / tick). As a result, the number of PHASE2 ticks may be zero, causing an underflow when subtracting 1 to configure the hardware. While this results in a longer-than-expected time to system reset, the duration of PHASE1 and minimum ping interval for the watchdog would still be correct. As the watchdog core ensures pretimeout is strictly less than timeout, ceil(timeout / tick) is strictly greater than floor(pretimeout / tick) and the number of PHASE1 ticks cannot be 0. So instead of rounding up the number of PHASE1 ticks, we can round down the number of PHASE2 ticks, maintaining the current behavior while avoiding underflows. The original helper function is now inlined, as it doesn't save any duplication anymore. Signed-off-by: Sander Vanheule Link: https://lore.kernel.org/r/20260515212351.752054-2-sander@svanheule.net Signed-off-by: Guenter Roeck

watchdog: apple: Add "apple,t8103-wdt" compatible

2026-05-11T14:03:45+00:00

After discussion with the devicetree maintainers we agreed to not extend lists with the generic compatible "apple,wdt" anymore [1]. Use "apple,t8103-wdt" as base compatible as it is the SoC the driver and bindings were written for. [1]: https://lore.kernel.org/asahi/12ab93b7-1fc2-4ce0-926e-c8141cfe81bf@kernel.org/ Fixes: 4ed224aeaf66 ("watchdog: Add Apple SoC watchdog driver") Cc: stable@vger.kernel.org Reviewed-by: Neal Gompa Signed-off-by: Janne Grunau Link: https://lore.kernel.org/r/20251231-watchdog-apple-t8103-base-compat-v1-1-1702a02e0c45@jannau.net Signed-off-by: Guenter Roeck

watchdog: rzn1: remove now obsolete interrupt support

2026-05-10T15:31:34+00:00

Previously, it was overlooked that the watchdog could reset the system directly. So, a workaround using the interrupt which called emergency_restart() was implemented. We now configure the controller when booting properly to allow watchdog resets directly. Thus, remove the interrupt workaround. Signed-off-by: Wolfram Sang Reviewed-by: Herve Codina Link: https://lore.kernel.org/r/20260507102410.43384-4-wsa+renesas@sang-engineering.com Signed-off-by: Guenter Roeck