watchdog: take all OF aliases into account when assigning id

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If some, but not all, watchdog devices have device tree aliases, those
without aliases might (depending on probe order) be assigned an id
which would otherwise be assigned to one of those with an alias.

This is problematic when for example watchdog0 is an alias for an
always-running gpio watchdog that userspace must handle, but the SOC's
watchdog device(s) get probed first and thus one of those become
/dev/watchdog0, and then at some point later, the gpio watchdog device
gets probed and becomes /dev/watchdog5.

Ensure that ids for devices without a device tree alias are allocated
from among those where no watchdogX alias exists.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20260714105356.2931450-1-linux@rasmusvillemoes.dk
[groeck: Use scnprintf() instead of snprintf() to make gcc happy]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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Rasmus Villemoes 2026-07-14 12:53:56 +02:00 • committed by Guenter Roeck

parent 5e845fe634

commit 19ff50d05f

1 changed files with 23 additions and 3 deletions

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drivers/watchdog/watchdog_core.c

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