1 files changed, 22 insertions, 42 deletions

diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index cd578843277e..c3fbb6068c52 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -218,7 +218,7 @@ static int dw_wdt_set_timeout(struct watchdog_device *wdd, unsigned int top_s)
 
 	/*
 	 * Set the new value in the watchdog.  Some versions of dw_wdt
-	 * have have TOPINIT in the TIMEOUT_RANGE register (as per
+	 * have TOPINIT in the TIMEOUT_RANGE register (as per
 	 * CP_WDT_DUAL_TOP in WDT_COMP_PARAMS_1).  On those we
 	 * effectively get a pat of the watchdog right here.
 	 */
@@ -375,7 +375,6 @@ static irqreturn_t dw_wdt_irq(int irq, void *devid)
 	return IRQ_HANDLED;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int dw_wdt_suspend(struct device *dev)
 {
 	struct dw_wdt *dw_wdt = dev_get_drvdata(dev);
@@ -410,9 +409,8 @@ static int dw_wdt_resume(struct device *dev)
 
 	return 0;
 }
-#endif /* CONFIG_PM_SLEEP */
 
-static SIMPLE_DEV_PM_OPS(dw_wdt_pm_ops, dw_wdt_suspend, dw_wdt_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(dw_wdt_pm_ops, dw_wdt_suspend, dw_wdt_resume);
 
 /*
  * In case if DW WDT IP core is synthesized with fixed TOP feature disabled the
@@ -568,22 +566,16 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
 	 * to the common timer/bus clocks configuration, in which the very
 	 * first found clock supply both timer and APB signals.
 	 */
-	dw_wdt->clk = devm_clk_get(dev, "tclk");
+	dw_wdt->clk = devm_clk_get_enabled(dev, "tclk");
 	if (IS_ERR(dw_wdt->clk)) {
-		dw_wdt->clk = devm_clk_get(dev, NULL);
+		dw_wdt->clk = devm_clk_get_enabled(dev, NULL);
 		if (IS_ERR(dw_wdt->clk))
 			return PTR_ERR(dw_wdt->clk);
 	}
 
-	ret = clk_prepare_enable(dw_wdt->clk);
-	if (ret)
-		return ret;
-
 	dw_wdt->rate = clk_get_rate(dw_wdt->clk);
-	if (dw_wdt->rate == 0) {
-		ret = -EINVAL;
-		goto out_disable_clk;
-	}
+	if (dw_wdt->rate == 0)
+		return -EINVAL;
 
 	/*
 	 * Request APB clock if device is configured with async clocks mode.
@@ -592,21 +584,13 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
 	 * so the pclk phandle reference is left optional. If it couldn't be
 	 * found we consider the device configured in synchronous clocks mode.
 	 */
-	dw_wdt->pclk = devm_clk_get_optional(dev, "pclk");
-	if (IS_ERR(dw_wdt->pclk)) {
-		ret = PTR_ERR(dw_wdt->pclk);
-		goto out_disable_clk;
-	}
-
-	ret = clk_prepare_enable(dw_wdt->pclk);
-	if (ret)
-		goto out_disable_clk;
+	dw_wdt->pclk = devm_clk_get_optional_enabled(dev, "pclk");
+	if (IS_ERR(dw_wdt->pclk))
+		return PTR_ERR(dw_wdt->pclk);
 
 	dw_wdt->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
-	if (IS_ERR(dw_wdt->rst)) {
-		ret = PTR_ERR(dw_wdt->rst);
-		goto out_disable_pclk;
-	}
+	if (IS_ERR(dw_wdt->rst))
+		return PTR_ERR(dw_wdt->rst);
 
 	/* Enable normal reset without pre-timeout by default. */
 	dw_wdt_update_mode(dw_wdt, DW_WDT_RMOD_RESET);
@@ -623,12 +607,12 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
 				       IRQF_SHARED | IRQF_TRIGGER_RISING,
 				       pdev->name, dw_wdt);
 		if (ret)
-			goto out_disable_pclk;
+			return ret;
 
 		dw_wdt->wdd.info = &dw_wdt_pt_ident;
 	} else {
 		if (ret == -EPROBE_DEFER)
-			goto out_disable_pclk;
+			return ret;
 
 		dw_wdt->wdd.info = &dw_wdt_ident;
 	}
@@ -637,7 +621,7 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
 
 	ret = dw_wdt_init_timeouts(dw_wdt, dev);
 	if (ret)
-		goto out_disable_clk;
+		goto out_assert_rst;
 
 	wdd = &dw_wdt->wdd;
 	wdd->ops = &dw_wdt_ops;
@@ -660,29 +644,29 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
 	} else {
 		wdd->timeout = DW_WDT_DEFAULT_SECONDS;
 		watchdog_init_timeout(wdd, 0, dev);
+		/* Limit timeout value to hardware constraints. */
+		dw_wdt_set_timeout(wdd, wdd->timeout);
 	}
 
 	platform_set_drvdata(pdev, dw_wdt);
 
 	watchdog_set_restart_priority(wdd, 128);
+	watchdog_stop_on_reboot(wdd);
 
 	ret = watchdog_register_device(wdd);
 	if (ret)
-		goto out_disable_pclk;
+		goto out_assert_rst;
 
 	dw_wdt_dbgfs_init(dw_wdt);
 
 	return 0;
 
-out_disable_pclk:
-	clk_disable_unprepare(dw_wdt->pclk);
-
-out_disable_clk:
-	clk_disable_unprepare(dw_wdt->clk);
+out_assert_rst:
+	reset_control_assert(dw_wdt->rst);
 	return ret;
 }
 
-static int dw_wdt_drv_remove(struct platform_device *pdev)
+static void dw_wdt_drv_remove(struct platform_device *pdev)
 {
 	struct dw_wdt *dw_wdt = platform_get_drvdata(pdev);
 
@@ -690,10 +674,6 @@ static int dw_wdt_drv_remove(struct platform_device *pdev)
 
 	watchdog_unregister_device(&dw_wdt->wdd);
 	reset_control_assert(dw_wdt->rst);
-	clk_disable_unprepare(dw_wdt->pclk);
-	clk_disable_unprepare(dw_wdt->clk);
-
-	return 0;
 }
 
 #ifdef CONFIG_OF
@@ -710,7 +690,7 @@ static struct platform_driver dw_wdt_driver = {
 	.driver		= {
 		.name	= "dw_wdt",
 		.of_match_table = of_match_ptr(dw_wdt_of_match),
-		.pm	= &dw_wdt_pm_ops,
+		.pm	= pm_sleep_ptr(&dw_wdt_pm_ops),
 	},
 };