Commit 3f6f1f1f authored by Luca Ceresoli's avatar Luca Ceresoli Committed by Lee Jones
Browse files

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: default avatarLuca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 254099d8

drivers/watchdog/max77620_wdt.c

+5 −0
Original line number Diff line number Diff line
@@ -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)