serial: 8250_of: Use devm_clk_get_enabled()

Use devm_clk_get_enabled() to simplify the code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://lore.kernel.org/r/20230919195519.3197963-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_of.c

@@ -47,16 +47,12 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	if (of_property_read_u32(np, "clock-frequency", &clk)) {
 
 		/* Get clk rate through clk driver if present */
-		info->clk = devm_clk_get(&ofdev->dev, NULL);
+		info->clk = devm_clk_get_enabled(dev, NULL);
 		if (IS_ERR(info->clk)) {
 			ret = dev_err_probe(dev, PTR_ERR(info->clk), "failed to get clock\n");
 			goto err_pmruntime;
 		}
 
-		ret = clk_prepare_enable(info->clk);
-		if (ret < 0)
-			goto err_pmruntime;
-
 		clk = clk_get_rate(info->clk);
 	}
 	/* If current-speed was set, then try not to change it. */
@@ -66,7 +62,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	ret = of_address_to_resource(np, 0, &resource);
 	if (ret) {
 		dev_err_probe(dev, ret, "invalid address\n");
-		goto err_unprepare;
+		goto err_pmruntime;
 	}
 
 	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT |
@@ -85,7 +81,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 			if (prop >= port->mapsize) {
 				ret = dev_err_probe(dev, -EINVAL, "reg-offset %u exceeds region size %pa\n",
 						    prop, &port->mapsize);
-				goto err_unprepare;
+				goto err_pmruntime;
 			}
 
 			port->mapbase += prop;
@@ -108,7 +104,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 			default:
 				ret = dev_err_probe(dev, -EINVAL, "unsupported reg-io-width (%u)\n",
 						    prop);
-				goto err_unprepare;
+				goto err_pmruntime;
 			}
 		}
 		port->flags |= UPF_IOREMAP;
@@ -135,7 +131,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	if (irq < 0) {
 		if (irq == -EPROBE_DEFER) {
 			ret = -EPROBE_DEFER;
-			goto err_unprepare;
+			goto err_pmruntime;
 		}
 		/* IRQ support not mandatory */
 		irq = 0;
@@ -146,12 +142,12 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
 	if (IS_ERR(info->rst)) {
 		ret = PTR_ERR(info->rst);
-		goto err_unprepare;
+		goto err_pmruntime;
 	}
 
 	ret = reset_control_deassert(info->rst);
 	if (ret)
-		goto err_unprepare;
+		goto err_pmruntime;
 
 	port->type = type;
 	port->uartclk = clk;
@@ -169,7 +165,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	case PORT_RT2880:
 		ret = rt288x_setup(port);
 		if (ret)
-			goto err_unprepare;
+			goto err_pmruntime;
 		break;
 	}
 
@@ -181,8 +177,6 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	}
 
 	return 0;
-err_unprepare:
-	clk_disable_unprepare(info->clk);
 err_pmruntime:
 	pm_runtime_put_sync(&ofdev->dev);
 	pm_runtime_disable(&ofdev->dev);
@@ -249,7 +243,6 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 	irq_dispose_mapping(port8250.port.irq);
 	pm_runtime_put_sync(&ofdev->dev);
 	pm_runtime_disable(&ofdev->dev);
-	clk_disable_unprepare(info->clk);
 err_free:
 	kfree(info);
 	return ret;
@@ -267,7 +260,6 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
 	reset_control_assert(info->rst);
 	pm_runtime_put_sync(&ofdev->dev);
 	pm_runtime_disable(&ofdev->dev);
-	clk_disable_unprepare(info->clk);
 	kfree(info);
 	return 0;
 }