watchdog: qcom: Report reboot reason

The Qualcom watchdog timer block reports if the system was reset by the
watchdog. Pass the information to user space.

Reviewed-by: Grant Grundler <grundler@chromium.org>
Tested-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 20563ccb7be0..a043fa4f60e5 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -21,6 +21,7 @@
 
 #define WDT_RST         0x38
 #define WDT_EN          0x40
+#define WDT_STS         0x44
 #define WDT_BITE_TIME   0x5C
 
 struct qcom_wdt {
@@ -108,7 +109,8 @@ static const struct watchdog_ops qcom_wdt_ops = {
 static const struct watchdog_info qcom_wdt_info = {
         .options        = WDIOF_KEEPALIVEPING
                         | WDIOF_MAGICCLOSE
-                        | WDIOF_SETTIMEOUT,
+                        | WDIOF_SETTIMEOUT
+                        | WDIOF_CARDRESET,
         .identity       = KBUILD_MODNAME,
 };
 
@@ -171,6 +173,9 @@ static int qcom_wdt_probe(struct platform_device *pdev)
         wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
         wdt->wdd.parent = &pdev->dev;
 
+        if (readl(wdt->base + WDT_STS) & 1)
+                wdt->wdd.bootstatus = WDIOF_CARDRESET;
+
         /*
          * If 'timeout-sec' unspecified in devicetree, assume a 30 second
          * default, unless the max timeout is less than 30 seconds, then use