watchdog: dw_wdt: Simplify clk management

Use devm_clk_get_enabled() instead of hand-writing it.
This saves some LoC.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/f6094c55cacf9637d835cd49290d9e888faeb0f7.1682491863.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: tititiou36

drivers/watchdog/dw_wdt.c

@@ -566,22 +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.
@@ -590,21 +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);
@@ -621,12 +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;
 	}
@@ -675,12 +661,6 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
 
 out_assert_rst:
 	reset_control_assert(dw_wdt->rst);
-
-out_disable_pclk:
-	clk_disable_unprepare(dw_wdt->pclk);
-
-out_disable_clk:
-	clk_disable_unprepare(dw_wdt->clk);
 	return ret;
 }
 
@@ -692,8 +672,6 @@ static void 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);
 }
 
 #ifdef CONFIG_OF