watchdog: davinci_wdt: update to devm_* API

Update the code to use devm_* API so that driver
core will manage resources.

Signed-off-by: Kumar, Anil <anilkumar.v@ti.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 5 insertions, 21 deletions

diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index c3c2f8205ef1..7df1fdca9e78 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -69,7 +69,6 @@ static unsigned long wdt_status;
 #define WDT_REGION_INITED 2
 #define WDT_DEVICE_INITED 3
 
-static struct resource  *wdt_mem;
 static void __iomem     *wdt_base;
 struct clk              *wdt_clk;
 
@@ -201,8 +200,9 @@ static struct miscdevice davinci_wdt_miscdev = {
 
 static int davinci_wdt_probe(struct platform_device *pdev)
 {
-        int ret = 0, size;
+        int ret = 0;
         struct device *dev = &pdev->dev;
+        struct resource  *wdt_mem;
 
         wdt_clk = devm_clk_get(dev, NULL);
         if (WARN_ON(IS_ERR(wdt_clk)))
@@ -221,41 +221,25 @@ static int davinci_wdt_probe(struct platform_device *pdev)
                 return -ENOENT;
         }
 
-        size = resource_size(wdt_mem);
-        if (!request_mem_region(wdt_mem->start, size, pdev->name)) {
-                dev_err(dev, "failed to get memory region\n");
-                return -ENOENT;
-        }
-
-        wdt_base = ioremap(wdt_mem->start, size);
+        wdt_base = devm_request_and_ioremap(dev, wdt_mem);
         if (!wdt_base) {
-                dev_err(dev, "failed to map memory region\n");
-                release_mem_region(wdt_mem->start, size);
-                wdt_mem = NULL;
-                return -ENOMEM;
+                dev_err(dev, "ioremap failed\n");
+                return -EADDRNOTAVAIL;
         }
 
         ret = misc_register(&davinci_wdt_miscdev);
         if (ret < 0) {
                 dev_err(dev, "cannot register misc device\n");
-                release_mem_region(wdt_mem->start, size);
-                wdt_mem = NULL;
         } else {
                 set_bit(WDT_DEVICE_INITED, &wdt_status);
         }
 
-        iounmap(wdt_base);
         return ret;
 }
 
 static int davinci_wdt_remove(struct platform_device *pdev)
 {
         misc_deregister(&davinci_wdt_miscdev);
-        if (wdt_mem) {
-                release_mem_region(wdt_mem->start, resource_size(wdt_mem));
-                wdt_mem = NULL;
-        }
-
         clk_disable_unprepare(wdt_clk);
 
         return 0;