[PATCH] rtc: ftrtc010: use devm_platform_ioremap_resource()

[Rosen Penev]

Replace the open-coded platform_get_resource() plus devm_ioremap()
sequence with devm_platform_ioremap_resource(), and propagate its
ERR_PTR() directly.

This also reserves the MMIO region. The only user, gemini.dtsi,
describes a single 0x100 window at 0x45000000 that no other node
overlaps, so this introduces no conflict.

Assisted-by: LLM
Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 drivers/rtc/rtc-ftrtc010.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/rtc/rtc-ftrtc010.c b/drivers/rtc/rtc-ftrtc010.c
index b29c96be40f4..3e88cb224f67 100644
--- a/drivers/rtc/rtc-ftrtc010.c
+++ b/drivers/rtc/rtc-ftrtc010.c
@@ -111,7 +111,6 @@ static int ftrtc010_rtc_probe(struct platform_device *pdev)
 	u32 days, hour, min, sec;
 	struct ftrtc010_rtc *rtc;
 	struct device *dev = &pdev->dev;
-	struct resource *res;
 	struct rtc_device *rtc_dev;
 	int ret;
 
@@ -135,14 +134,9 @@ static int ftrtc010_rtc_probe(struct platform_device *pdev)
 	if (rtc->rtc_irq < 0)
 		return rtc->rtc_irq;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
-	rtc->rtc_base = devm_ioremap(dev, res->start,
-				     resource_size(res));
-	if (!rtc->rtc_base)
-		return -ENOMEM;
+	rtc->rtc_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rtc->rtc_base))
+		return PTR_ERR(rtc->rtc_base);
 
 	rtc_dev = devm_rtc_allocate_device(dev);
 	if (IS_ERR(rtc_dev))
-- 
2.56.0