On Thu, Aug 29, 2019 at 04:38:14PM +0200, Eugeniu Rosca wrote: > Hi George, > > On Thu, Aug 29, 2019 at 12:39:25AM -0400, George G. Davis wrote: > > Some systems have multiple watchdog devices where the first device > > registered is assigned to the /dev/watchdog device file. > > Confirmed on R-Car H3-Salvator-X: > > root@rcar-gen3:~# ls -al /dev/watchdog* > crw------- 1 root root 10, 130 Aug 21 09:38 /dev/watchdog > crw------- 1 root root 247, 0 Aug 21 09:38 /dev/watchdog0 Based on [1], I think this patch is actually helpful when there is at least a /dev/watchdog1 in the system. Particularly on R-Car3, this happens when enabling softdog in addition to the standard RWDT: root@rcar-gen3:~# ls -al /dev/watchdog* crw------- 1 root root 10, 130 Aug 21 09:38 /dev/watchdog crw------- 1 root root 247, 0 Aug 21 09:38 /dev/watchdog0 crw------- 1 root root 247, 1 Aug 21 09:38 /dev/watchdog1 [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/watchdog/watchdog-kernel-api.rst?h=v5.3-rc6#n71 ----8<---- id 0 is special. It has both a /dev/watchdog0 cdev (dynamic major, minor 0) as well as the old /dev/watchdog miscdev. ----8<---- -- Best Regards, Eugeniu.
