watchdog: qcom: Add suspend/resume support

This adds the support for qcom watchdog suspend and resume
when entering and exiting deep sleep states. Otherwise
having watchdog active after suspend would result in unwanted
crashes/resets if resume happens after a long time.

Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 7809713..5dfd604 100644 (file)
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -245,6 +245,28 @@ static int qcom_wdt_remove(struct platform_device *pdev)
        return 0;
 }
 
+static int __maybe_unused qcom_wdt_suspend(struct device *dev)
+{
+       struct qcom_wdt *wdt = dev_get_drvdata(dev);
+
+       if (watchdog_active(&wdt->wdd))
+               qcom_wdt_stop(&wdt->wdd);
+
+       return 0;
+}
+
+static int __maybe_unused qcom_wdt_resume(struct device *dev)
+{
+       struct qcom_wdt *wdt = dev_get_drvdata(dev);
+
+       if (watchdog_active(&wdt->wdd))
+               qcom_wdt_start(&wdt->wdd);
+
+       return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(qcom_wdt_pm_ops, qcom_wdt_suspend, qcom_wdt_resume);
+
 static const struct of_device_id qcom_wdt_of_table[] = {
        { .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr },
        { .compatible = "qcom,scss-timer", .data = reg_offset_data_apcs_tmr },
@@ -259,6 +281,7 @@ static struct platform_driver qcom_watchdog_driver = {
        .driver = {
                .name           = KBUILD_MODNAME,
                .of_match_table = qcom_wdt_of_table,
+               .pm             = &qcom_wdt_pm_ops,
        },
 };
 module_platform_driver(qcom_watchdog_driver);