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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>
This commit is contained in:
Luca Ceresoli 2022-02-23 18:59:07 +01:00 committed by Lee Jones
parent 254099d8fa
commit 3f6f1f1f9f
1 changed files with 5 additions and 0 deletions
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5
drivers/watchdog/max77620_wdt.c
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@ -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)