watchdog: xilinx: Simplify probe and remove functions

Use devm_ helper function to simplify probe and error path.
Move ioremap to the beginning of probe function.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c
index 9cab3fd4f14c286c5fb521781d7fca4787d36f5e..39e61e15f7233e7671f9e32bcfd277e1894b4798 100644 (file)
--- a/drivers/watchdog/of_xilinx_wdt.c
+++ b/drivers/watchdog/of_xilinx_wdt.c
@@ -12,6 +12,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/err.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -43,7 +44,6 @@
 #define PFX WATCHDOG_NAME ": "
 
 struct xwdt_device {
-       struct resource  res;
        void __iomem *base;
        u32 wdt_interval;
 };
@@ -158,9 +158,15 @@ static int xwdt_probe(struct platform_device *pdev)
        int rc;
        u32 *tmptr;
        u32 *pfreq;
+       struct resource *res;
 
        no_timeout = 0;
 
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       xdev.base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(xdev.base))
+               return PTR_ERR(xdev.base);
+
        pfreq = (u32 *)of_get_property(pdev->dev.of_node,
                                        "clock-frequency", NULL);
 
@@ -169,12 +175,6 @@ static int xwdt_probe(struct platform_device *pdev)
                no_timeout = 1;
        }
 
-       rc = of_address_to_resource(pdev->dev.of_node, 0, &xdev.res);
-       if (rc) {
-               pr_warn("invalid address!\n");
-               return rc;
-       }
-
        tmptr = (u32 *)of_get_property(pdev->dev.of_node,
                                        "xlnx,wdt-interval", NULL);
        if (tmptr == NULL) {
@@ -198,50 +198,27 @@ static int xwdt_probe(struct platform_device *pdev)
        if (!no_timeout)
                timeout = 2 * ((1<<xdev.wdt_interval) / *pfreq);
 
-       if (!request_mem_region(xdev.res.start,
-                       xdev.res.end - xdev.res.start + 1, WATCHDOG_NAME)) {
-               rc = -ENXIO;
-               pr_err("memory request failure!\n");
-               goto err_out;
-       }
-
-       xdev.base = ioremap(xdev.res.start, xdev.res.end - xdev.res.start + 1);
-       if (xdev.base == NULL) {
-               rc = -ENOMEM;
-               pr_err("ioremap failure!\n");
-               goto release_mem;
-       }
-
        rc = xwdt_selftest();
        if (rc == XWT_TIMER_FAILED) {
                pr_err("SelfTest routine error!\n");
-               goto unmap_io;
+               return rc;
        }
 
        rc = watchdog_register_device(&xilinx_wdt_wdd);
        if (rc) {
                pr_err("cannot register watchdog (err=%d)\n", rc);
-               goto unmap_io;
+               return rc;
        }
 
        dev_info(&pdev->dev, "Xilinx Watchdog Timer at %p with timeout %ds\n",
                 xdev.base, timeout);
 
        return 0;
-
-unmap_io:
-       iounmap(xdev.base);
-release_mem:
-       release_mem_region(xdev.res.start, resource_size(&xdev.res));
-err_out:
-       return rc;
 }
 
 static int xwdt_remove(struct platform_device *dev)
 {
        watchdog_unregister_device(&xilinx_wdt_wdd);
-       iounmap(xdev.base);
-       release_mem_region(xdev.res.start, resource_size(&xdev.res));
 
        return 0;
 }