Currently, the renesas-rwdt driver is not precise with input clocks which have a remainder after the clock divisors are applied. This series should fix the situation and also pays attention to ensure variables have proper types and are divided properly. As a cherry on top, we also get a new divider value to allow for higher max_timeout :)
Originally brought to attention by this BSP patch: https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-bsp.git/commit/?id=7d56256a4d189a83e278ec2013eb1f3648bc7411 Tested with a Salvator-X (R-Car M3-W) and the clock driver hacked to supply the internal clock of 32552 Hz instead of the externally supplied 32768 Hz. A branch can be found here: git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/watchdog-fixes Please comment or apply... Thanks, Wolfram Wolfram Sang (5): watchdog: renesas_wdt: avoid (theoretical) type overflow watchdog: renesas_wdt: check rate also for upper limit watchdog: renesas_wdt: don't round closest with get_timeleft watchdog: renesas_wdt: apply better precision watchdog: renesas_wdt: add another divider option drivers/watchdog/renesas_wdt.c | 37 ++++++++++++++++++++++++------------- 1 file changed, 24 insertions(+), 13 deletions(-) -- 2.11.0
