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| author | Alice Guo <alice.guo@nxp.com> | 2022-08-25 16:32:56 +0800 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2022-10-02 12:55:47 +0200 |
| commit | 8ed2dc48551354bbf33df869f3968b7805cbaa61 (patch) | |
| tree | 2c4597c548f067a49963ae442bbf70c7234c8151 /drivers/watchdog/sp5100_tco.c | |
| parent | cef6bc98d50da24252fb289759f1790e17afa448 (diff) | |
| download | linux-stable-8ed2dc48551354bbf33df869f3968b7805cbaa61.tar.gz linux-stable-8ed2dc48551354bbf33df869f3968b7805cbaa61.tar.bz2 linux-stable-8ed2dc48551354bbf33df869f3968b7805cbaa61.zip | |
watchdog: imx93: add watchdog timer on imx93
The WDOG clocks are sourced from lpo_clk, and lpo_clk is the fixed
32KHz. TOVAL contains the 16-bit value used to set the timeout period of
the watchdog. When the timeout period exceeds 2 seconds, the value
written to the TOVAL register is larger than 16-bit can represent.
Enabling watchdog prescaler can solve this problem.
Two points need to be aware of:
1. watchdog prescaler enables a fixed 256 pre-scaling of watchdog
counter reference clock
2. reconfiguration takes about 55ms on imx93
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Alice Guo <alice.guo@nxp.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220825083256.14565-8-alice.guo@oss.nxp.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/sp5100_tco.c')
0 files changed, 0 insertions, 0 deletions