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| author | Luca Ceresoli <luca@lucaceresoli.net> | 2022-02-23 18:59:07 +0100 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2022-03-07 13:54:58 +0000 |
| commit | 3f6f1f1f9f12c16934304ceca342b7ba83639da9 (patch) | |
| tree | ab11d821fcdefaddbc3b90983525fa9707dd0168 | |
| parent | 254099d8fafcd80e11a3246f6ff62af816a2b566 (diff) | |
| download | linux-3f6f1f1f9f12c16934304ceca342b7ba83639da9.tar.bz2 | |
watchdog: max77620: Add comment to clarify set_timeout procedure
Clarify why we need to ping the watchdog before changing the timeout by
quoting the MAX77714 datasheet.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
| -rw-r--r-- | drivers/watchdog/max77620_wdt.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/watchdog/max77620_wdt.c b/drivers/watchdog/max77620_wdt.c index cd321c7e0d59..b76ad6ba0915 100644 --- a/drivers/watchdog/max77620_wdt.c +++ b/drivers/watchdog/max77620_wdt.c @@ -123,6 +123,11 @@ static int max77620_wdt_set_timeout(struct watchdog_device *wdt_dev, break; } + /* + * "If the value of TWD needs to be changed, clear the system + * watchdog timer first [...], then change the value of TWD." + * (MAX77714 datasheet but applies to MAX77620 too) + */ ret = regmap_update_bits(wdt->rmap, wdt->drv_data->reg_cnfg_glbl3, wdt->drv_data->wdtc_mask, 0x1); if (ret < 0) |