The PMIC does store the power-off factor internally.
Read it out and report it as bootstatus.
Signed-off-by: Marcus Folkesson <marcus.folkesson@xxxxxxxxx>
---
drivers/watchdog/rn5t618_wdt.c | 12 ++++++++++++
include/linux/mfd/rn5t618.h | 9 +++++++++
2 files changed, 21 insertions(+)
diff --git a/drivers/watchdog/rn5t618_wdt.c b/drivers/watchdog/rn5t618_wdt.c
index 6e524c8e26a8..40d8ebd8c0ac 100644
--- a/drivers/watchdog/rn5t618_wdt.c
+++ b/drivers/watchdog/rn5t618_wdt.c
@@ -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);
diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
index 8aa0bda1af4f..aacb6d51e99c 100644
--- a/include/linux/mfd/rn5t618.h
+++ b/include/linux/mfd/rn5t618.h
@@ -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,
--
2.37.1
