rtc: rtc-s3c: Updates RTC driver for clock enabling support

This Patch updates existing Samsung RTC driver for clock enabling support.

Signed-off-by: Atul Dahiya <atul.dahiya@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: Wan ZongShun <mcuos.com@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 70b68d35f969..c032a15c84ab 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -1,5 +1,8 @@
 /* drivers/rtc/rtc-s3c.c
  *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com/
+ *
  * Copyright (c) 2004,2006 Simtec Electronics
  *      Ben Dooks, <ben@simtec.co.uk>
  *      http://armlinux.simtec.co.uk/
@@ -39,6 +42,7 @@ enum s3c_cpu_type {
 
 static struct resource *s3c_rtc_mem;
 
+static struct clk *rtc_clk;
 static void __iomem *s3c_rtc_base;
 static int s3c_rtc_alarmno = NO_IRQ;
 static int s3c_rtc_tickno  = NO_IRQ;
@@ -431,6 +435,10 @@ static int __devexit s3c_rtc_remove(struct platform_device *dev)
         s3c_rtc_setpie(&dev->dev, 0);
         s3c_rtc_setaie(0);
 
+        clk_disable(rtc_clk);
+        clk_put(rtc_clk);
+        rtc_clk = NULL;
+
         iounmap(s3c_rtc_base);
         release_resource(s3c_rtc_mem);
         kfree(s3c_rtc_mem);
@@ -488,6 +496,16 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
                 goto err_nomap;
         }
 
+        rtc_clk = clk_get(&pdev->dev, "rtc");
+        if (IS_ERR(rtc_clk)) {
+                dev_err(&pdev->dev, "failed to find rtc clock source\n");
+                ret = PTR_ERR(rtc_clk);
+                rtc_clk = NULL;
+                goto err_clk;
+        }
+
+        clk_enable(rtc_clk);
+
         /* check to see if everything is setup correctly */
 
         s3c_rtc_enable(pdev, 1);
@@ -523,6 +541,10 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 
  err_nortc:
         s3c_rtc_enable(pdev, 0);
+        clk_disable(rtc_clk);
+        clk_put(rtc_clk);
+
+ err_clk:
         iounmap(s3c_rtc_base);
 
  err_nomap: