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46fb093b87Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
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626 lines
16 KiB