rtc: Convert to devm_ioremap_resource()

Convert all uses of devm_request_and_ioremap() to the newly introduced
devm_ioremap_resource() which provides more consistent error handling.

devm_ioremap_resource() provides its own error messages so all explicit
error messages can be removed from the failure code paths.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/rtc/rtc-s3c.c

@@ -486,11 +486,9 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	s3c_rtc_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (s3c_rtc_base == NULL) {
-		dev_err(&pdev->dev, "failed to ioremap memory region\n");
-		return -EINVAL;
-	}
+	s3c_rtc_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(s3c_rtc_base))
+		return PTR_ERR(s3c_rtc_base);
 
 	rtc_clk = devm_clk_get(&pdev->dev, "rtc");
 	if (IS_ERR(rtc_clk)) {

drivers/rtc/rtc-snvs.c

@@ -252,9 +252,9 @@ static int snvs_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	data->ioaddr = devm_request_and_ioremap(&pdev->dev, res);
-	if (!data->ioaddr)
-		return -EADDRNOTAVAIL;
+	data->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->ioaddr))
+		return PTR_ERR(data->ioaddr);
 
 	data->irq = platform_get_irq(pdev, 0);
 	if (data->irq < 0)

drivers/rtc/rtc-spear.c

@@ -385,11 +385,9 @@ static int spear_rtc_probe(struct platform_device *pdev)
 		return status;
 	}
 
-	config->ioaddr = devm_request_and_ioremap(&pdev->dev, res);
-	if (!config->ioaddr) {
-		dev_err(&pdev->dev, "request-ioremap fail\n");
-		return -ENOMEM;
-	}
+	config->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(config->ioaddr))
+		return PTR_ERR(config->ioaddr);
 
 	config->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(config->clk))

drivers/rtc/rtc-tegra.c

@@ -327,11 +327,9 @@ static int tegra_rtc_probe(struct platform_device *pdev)
 		return -EBUSY;
 	}
 
-	info->rtc_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (!info->rtc_base) {
-		dev_err(&pdev->dev, "Unable to request mem region and grab IOs for device.\n");
-		return -EBUSY;
-	}
+	info->rtc_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(info->rtc_base))
+		return PTR_ERR(info->rtc_base);
 
 	info->tegra_rtc_irq = platform_get_irq(pdev, 0);
 	if (info->tegra_rtc_irq <= 0)