rtc: Use devm_platform_ioremap_resource()

Simplify probe by using a known wrapper function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Akinobu Mita <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-fsl-ftm-alarm.c

···
 static int ftm_rtc_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	struct resource *r;
 	int irq;
 	int ret;
 	struct ftm_rtc *rtc;
···
 	if (IS_ERR(rtc->rtc_dev))
 		return PTR_ERR(rtc->rtc_dev);
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "cannot get resource for rtc\n");
-		return -ENODEV;
-	}
-
-	rtc->base = devm_ioremap_resource(&pdev->dev, r);
+	rtc->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rtc->base)) {
 		dev_err(&pdev->dev, "cannot ioremap resource for rtc\n");
 		return PTR_ERR(rtc->base);

drivers/rtc/rtc-goldfish.c

···
 static int goldfish_rtc_probe(struct platform_device *pdev)
 {
 	struct goldfish_rtc *rtcdrv;
-	struct resource *r;
 	int err;
 
 	rtcdrv = devm_kzalloc(&pdev->dev, sizeof(*rtcdrv), GFP_KERNEL);
···
 		return -ENOMEM;
 
 	platform_set_drvdata(pdev, rtcdrv);
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r)
-		return -ENODEV;
-
-	rtcdrv->base = devm_ioremap_resource(&pdev->dev, r);
+	rtcdrv->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rtcdrv->base))
 		return -ENODEV;
 

drivers/rtc/rtc-m48t86.c

···
 static int m48t86_rtc_probe(struct platform_device *pdev)
 {
 	struct m48t86_rtc_info *info;
-	struct resource *res;
 	unsigned char reg;
 	int err;
 	struct nvmem_config m48t86_nvmem_cfg = {
···
 	if (!info)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-	info->index_reg = devm_ioremap_resource(&pdev->dev, res);
+	info->index_reg = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(info->index_reg))
 		return PTR_ERR(info->index_reg);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (!res)
-		return -ENODEV;
-	info->data_reg = devm_ioremap_resource(&pdev->dev, res);
+	info->data_reg = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(info->data_reg))
 		return PTR_ERR(info->data_reg);
 

drivers/rtc/rtc-r7301.c

···
 
 static int __init rtc7301_rtc_probe(struct platform_device *dev)
 {
-	struct resource *res;
 	void __iomem *regs;
 	struct rtc7301_priv *priv;
 	struct rtc_device *rtc;
 	int ret;
 
-	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
 	priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
-	regs = devm_ioremap_resource(&dev->dev, res);
+	regs = devm_platform_ioremap_resource(dev, 0);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);