watchdog: rn5t618: add support for read out bootstatus

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>

diff --git a/drivers/watchdog/rn5t618_wdt.c b/drivers/watchdog/rn5t618_wdt.c
index 6e524c8e26a8f06a39ac0bf18aa2019c03c88fb2..40d8ebd8c0acd505d4c146432c448f3bebd8caaa 100644 (file)
--- 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 8aa0bda1af4fa2a043bb329db45de06c23c5c20f..aacb6d51e99cba04ce1711751aa1d5ac6385d6f8 100644 (file)
--- 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,