watchdog: imx_sc_wdt: Don't disable WDT in suspend

Parts of the suspend and resume chain is left unprotected if we disable
the WDT here.

>From experiments we can see that the SCU disables and re-enables the WDT
when we enter and leave suspend to ram. By not touching the WDT here we
are protected by the WDT all the way to the SCU.

Signed-off-by: Jonas Blixt <[email protected]>
CC: Anson Huang <[email protected]>
Fixes: 986857a ("watchdog: imx_sc: Add i.MX system controller watchdog support")
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: Jonas Blixt

drivers/watchdog/imx_sc_wdt.c

@@ -216,29 +216,6 @@ static int imx_sc_wdt_probe(struct platform_device *pdev)
 	return devm_watchdog_register_device(dev, wdog);
 }
 
-static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
-{
-	struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
-
-	if (watchdog_active(&imx_sc_wdd->wdd))
-		imx_sc_wdt_stop(&imx_sc_wdd->wdd);
-
-	return 0;
-}
-
-static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
-{
-	struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
-
-	if (watchdog_active(&imx_sc_wdd->wdd))
-		imx_sc_wdt_start(&imx_sc_wdd->wdd);
-
-	return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
-			 imx_sc_wdt_suspend, imx_sc_wdt_resume);
-
 static const struct of_device_id imx_sc_wdt_dt_ids[] = {
 	{ .compatible = "fsl,imx-sc-wdt", },
 	{ /* sentinel */ }
@@ -250,7 +227,6 @@ static struct platform_driver imx_sc_wdt_driver = {
 	.driver		= {
 		.name	= "imx-sc-wdt",
 		.of_match_table = imx_sc_wdt_dt_ids,
-		.pm	= &imx_sc_wdt_pm_ops,
 	},
 };
 module_platform_driver(imx_sc_wdt_driver);