diff options
| author | Chris Packham <chris.packham@alliedtelesis.co.nz> | 2020-07-27 15:46:14 +1200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2020-08-05 01:07:09 +0200 |
| commit | 9bf1306257589b3a5ad46175538af9922d94e26f (patch) | |
| tree | 86354542968affd37500b1b85f03b74a9977ed65 /drivers/rtc/rtc-ds1307.c | |
| parent | 3d6cfb36ed719e5efdc2a6a8e8ee07f185c88da1 (diff) | |
| download | linux-9bf1306257589b3a5ad46175538af9922d94e26f.tar.gz | |
rtc: ds1307: provide an indication that the watchdog has fired
There's not much feedback when the ds1388 watchdog fires. Generally it
yanks on the reset line and the board reboots. Capture the fact that the
watchdog has fired in the past so that userspace can retrieve it via
WDIOC_GETBOOTSTATUS. This should help distinguish a watchdog triggered
reset from a power interruption.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200727034615.19755-1-chris.packham@alliedtelesis.co.nz
Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
| -rw-r--r-- | drivers/rtc/rtc-ds1307.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index 49702942bb086..54c85cdd019dd 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -1668,6 +1668,8 @@ static const struct watchdog_ops ds1388_wdt_ops = { static void ds1307_wdt_register(struct ds1307 *ds1307) { struct watchdog_device *wdt; + int err; + int val; if (ds1307->type != ds_1388) return; @@ -1676,6 +1678,10 @@ static void ds1307_wdt_register(struct ds1307 *ds1307) if (!wdt) return; + err = regmap_read(ds1307->regmap, DS1388_REG_FLAG, &val); + if (!err && val & DS1388_BIT_WF) + wdt->bootstatus = WDIOF_CARDRESET; + wdt->info = &ds1388_wdt_info; wdt->ops = &ds1388_wdt_ops; wdt->timeout = 99; |