Re: [PATCH v2] clocksource: timer-tegra186: Enable WDT at probe

[Daniel Lezcano]

On Thu, Jul 03, 2025 at 04:34:15PM +0530, Kartik Rajput wrote:
> Currently, if the system crashes or hangs during kernel boot before
> userspace initializes and configures the watchdog timer, then the
> watchdog won’t be able to recover the system as it’s not running. This
> becomes crucial during an over-the-air update, where if the newly
> updated kernel crashes on boot, the watchdog is needed to reset the
> device and boot into an alternative system partition. If the watchdog
> is disabled in such scenarios, it can lead to the system getting
> bricked.
> 
> Enable the WDT during driver probe to allow recovery from any crash/hang
> seen during early kernel boot. Also, disable interrupts once userspace
> starts pinging the watchdog.

Please resend with proper recipients (linux-watchdog@, Wim Van
Sebroeck, Guenter Roeck) and the changelog.

Can someone take the opportunity to split this watchdog code and move
it in the proper watchdog drivers directory ?

As previously discussed, the auxiliary device seems the appropriate
approach [1][2].

Thanks
  -- Daniel

[1] https://lore.kernel.org/all/CABjd4YyXwznntcLVcYL6qx16YEwv4_VWzrXrE7_QHmQxiE0pXQ@xxxxxxxxxxxxxx/
[2] https://lore.kernel.org/all/20250521-vt8500-timer-updates-v4-3-2d4306a16ae4@xxxxxxxxx/


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