rtc: simplify getting .drvdata

We should get drvdata from struct device directly. Going via
platform_device is an unneeded step back and forth.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Michal Simek <michal.simek@xilinx.com> (for zynqmp)
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index 2d78118..5b7f02e 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -58,8 +58,7 @@ struct rtc_plat_data {
 
 static int ds1742_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr_rtc;
 	u8 century;
 
@@ -83,8 +82,7 @@ static int ds1742_rtc_set_time(struct device *dev, struct rtc_time *tm)
 
 static int ds1742_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr_rtc;
 	unsigned int year, month, day, hour, minute, second, week;
 	unsigned int century;