[PATCH v2 1/2] platform/x86: portwell-ec: Add suspend/resume support for watchdog

[jesse huang <jesse.huang@portwell.com.tw>]

Portwell EC does not disable the watchdog during suspend. To avoid unwanted
resets, this patch adds suspend and resume callbacks (pwec_suspend() and
pwec_resume()) to the driver.

The watchdog is stopped in pwec_suspend() and restarted in pwec_resume() if
it was active before suspend.

Signed-off-by: Yen-Chi Huang <jesse.huang@portwell.com.tw>
---

[Re-sending to fix message threading, no content changes since v2.]
---
 drivers/platform/x86/portwell-ec.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/platform/x86/portwell-ec.c b/drivers/platform/x86/portwell-ec.c
index 8b788822237b..a68522aaa3fa 100644
--- a/drivers/platform/x86/portwell-ec.c
+++ b/drivers/platform/x86/portwell-ec.c
@@ -245,11 +245,29 @@ static int pwec_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static int pwec_suspend(struct platform_device *pdev, pm_message_t message)
+{
+	if (watchdog_active(&ec_wdt_dev))
+		return pwec_wdt_stop(&ec_wdt_dev);
+
+	return 0;
+}
+
+static int pwec_resume(struct platform_device *pdev)
+{
+	if (watchdog_active(&ec_wdt_dev))
+		return pwec_wdt_start(&ec_wdt_dev);
+
+	return 0;
+}
+
 static struct platform_driver pwec_driver = {
 	.driver = {
 		.name = "portwell-ec",
 	},
 	.probe = pwec_probe,
+	.suspend = pm_ptr(pwec_suspend),
+	.resume = pm_ptr(pwec_resume),
 };
 
 static struct platform_device *pwec_dev;
-- 
2.34.1