rtc: rtc-davinci: use devm_ioremap_resource()

Use devm_ioremap_resource() in order to make the code simpler, and
remove redundant return value check of platform_get_resource() because
the value is checked by devm_ioremap_resource().

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 25 deletions

diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
index 1f3495e4e634..c0a3b59f65a2 100644
--- a/drivers/rtc/rtc-davinci.c
+++ b/drivers/rtc/rtc-davinci.c
@@ -119,8 +119,6 @@ static DEFINE_SPINLOCK(davinci_rtc_lock);
 struct davinci_rtc {
         struct rtc_device               *rtc;
         void __iomem                    *base;
-        resource_size_t                 pbase;
-        size_t                          base_size;
         int                             irq;
 };
 
@@ -482,7 +480,7 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
         struct davinci_rtc *davinci_rtc;
-        struct resource *res, *mem;
+        struct resource *res;
         int ret = 0;
 
         davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc), GFP_KERNEL);
@@ -496,28 +494,9 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
         }
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!res) {
-                dev_err(dev, "no mem resource\n");
-                return -EINVAL;
-        }
-
-        davinci_rtc->pbase = res->start;
-        davinci_rtc->base_size = resource_size(res);
-
-        mem = devm_request_mem_region(dev, davinci_rtc->pbase,
-                                davinci_rtc->base_size, pdev->name);
-        if (!mem) {
-                dev_err(dev, "RTC registers at %08x are not free\n",
-                        davinci_rtc->pbase);
-                return -EBUSY;
-        }
-
-        davinci_rtc->base = devm_ioremap(dev, davinci_rtc->pbase,
-                                        davinci_rtc->base_size);
-        if (!davinci_rtc->base) {
-                dev_err(dev, "unable to ioremap MEM resource\n");
-                return -ENOMEM;
-        }
+        davinci_rtc->base = devm_ioremap_resource(dev, res);
+        if (IS_ERR(davinci_rtc->base))
+                return PTR_ERR(davinci_rtc->base);
 
         platform_set_drvdata(pdev, davinci_rtc);