watchdog: sa11x0/pxa: get rid of get_clock_tick_rate

The OS timer rate used for the watchdog can now be fetched from the
standard clock API. This will remove the last user of
get_clock_tick_rate() in both pxa and sa11x0 architectures.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 23 insertions, 1 deletions

diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c
index e1d39a1e9628..8965e3f536c3 100644
--- a/drivers/watchdog/sa1100_wdt.c
+++ b/drivers/watchdog/sa1100_wdt.c
@@ -22,6 +22,7 @@
 
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/clk.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/fs.h>
@@ -155,12 +156,27 @@ static struct miscdevice sa1100dog_miscdev = {
 };
 
 static int margin __initdata = 60;              /* (secs) Default is 1 minute */
+static struct clk *clk;
 
 static int __init sa1100dog_init(void)
 {
         int ret;
 
-        oscr_freq = get_clock_tick_rate();
+        clk = clk_get(NULL, "OSTIMER0");
+        if (IS_ERR(clk)) {
+                pr_err("SA1100/PXA2xx Watchdog Timer: clock not found: %d\n",
+                       (int) PTR_ERR(clk));
+                return PTR_ERR(clk);
+        }
+
+        ret = clk_prepare_enable(clk);
+        if (ret) {
+                pr_err("SA1100/PXA2xx Watchdog Timer: clock failed to prepare+enable: %d\n",
+                       ret);
+                goto err;
+        }
+
+        oscr_freq = clk_get_rate(clk);
 
         /*
          * Read the reset status, and save it for later.  If
@@ -176,11 +192,17 @@ static int __init sa1100dog_init(void)
                 pr_info("SA1100/PXA2xx Watchdog Timer: timer margin %d sec\n",
                         margin);
         return ret;
+err:
+        clk_disable_unprepare(clk);
+        clk_put(clk);
+        return ret;
 }
 
 static void __exit sa1100dog_exit(void)
 {
         misc_deregister(&sa1100dog_miscdev);
+        clk_disable_unprepare(clk);
+        clk_put(clk);
 }
 
 module_init(sa1100dog_init);