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watchdog: rn5t618: add support for read out bootstatus

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The PMIC does store the power-off factor internally.
Read it out and report it as bootstatus.

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Acked-by: Lee Jones <lee@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20221028075019.2757812-1-marcus.folkesson@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Marcus Folkesson 2022-10-28 09:50:19 +02:00 committed by Wim Van Sebroeck
parent 758f46c2e6
commit 47c008050a
2 changed files with 21 additions and 0 deletions
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12
drivers/watchdog/rn5t618_wdt.c
View file

@ -144,6 +144,8 @@ static int rn5t618_wdt_probe(struct platform_device *pdev)
struct rn5t618 *rn5t618 = dev_get_drvdata(dev->parent);
struct rn5t618_wdt *wdt;
int min_timeout, max_timeout;
int ret;
unsigned int val;
wdt = devm_kzalloc(dev, sizeof(struct rn5t618_wdt), GFP_KERNEL);
if (!wdt)
@ -160,6 +162,16 @@ static int rn5t618_wdt_probe(struct platform_device *pdev)
wdt->wdt_dev.timeout = max_timeout;
wdt->wdt_dev.parent = dev;
/* Read out previous power-off factor */
ret = regmap_read(wdt->rn5t618->regmap, RN5T618_POFFHIS, &val);
if (ret)
return ret;
if (val & RN5T618_POFFHIS_VINDET)
wdt->wdt_dev.bootstatus = WDIOF_POWERUNDER;
else if (val & RN5T618_POFFHIS_WDG)
wdt->wdt_dev.bootstatus = WDIOF_CARDRESET;
watchdog_set_drvdata(&wdt->wdt_dev, wdt);
watchdog_init_timeout(&wdt->wdt_dev, timeout, dev);
watchdog_set_nowayout(&wdt->wdt_dev, nowayout);

9
include/linux/mfd/rn5t618.h
View file

@ -227,6 +227,15 @@
#define RN5T618_WATCHDOG_WDOGTIM_S 0
#define RN5T618_PWRIRQ_IR_WDOG BIT(6)
#define RN5T618_POFFHIS_PWRON BIT(0)
#define RN5T618_POFFHIS_TSHUT BIT(1)
#define RN5T618_POFFHIS_VINDET BIT(2)
#define RN5T618_POFFHIS_IODET BIT(3)
#define RN5T618_POFFHIS_CPU BIT(4)
#define RN5T618_POFFHIS_WDG BIT(5)
#define RN5T618_POFFHIS_DCLIM BIT(6)
#define RN5T618_POFFHIS_N_OE BIT(7)
enum {
RN5T618_DCDC1,
RN5T618_DCDC2,