watchdog: rti: drop hack manipulating WDT clock rate
The hack itself seems to be copied from Linux rti_wdt.c, but the WDT reset
principle is different in U-Boot. While Linux relies on correct frequencies
and timers and doesn't check the actual WDT counter value U-Boot driver
seems to be more robust: it does compare RTIDWDCNTR vs RTIDWDPRLD.
Now the root cause of the original motivation to manipulate the clock rate
is said to be understood and fixed in Linux commit cae58516534e
("watchdog: rti_wdt: Set min_hw_heartbeat_ms to accommodate a safety margin")
which simultaneously removed the hack itself.
While is fix part of the mentioned patch is neither applicable nor requried
for the U-Boot driver just drop the hack setting WDT clock rate to 90% of
the real rate. This has a nice effect that the WDT timeout is now as
requested and not 10% shorter.
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Stefan Roese <sr@denx.de>
1 file changed