Index: drivers/mtd/nand/s3c2410.c
===================================================================
RCS file: /home/cvs/mtd/drivers/mtd/nand/s3c2410.c,v
retrieving revision 1.21
retrieving revision 1.22
diff -u -p -r1.21 -r1.22
--- drivers/mtd/nand/s3c2410.c	29 Nov 2005 20:01:29 -0000	1.21
+++ drivers/mtd/nand/s3c2410.c	15 Mar 2006 22:32:08 -0000	1.22
@@ -18,8 +18,9 @@
  *	20-Jun-2005  BJD  Updated s3c2440 support, fixed timing bug
  *	08-Jul-2005  BJD  Fix OOPS when no platform data supplied
  *	20-Oct-2005  BJD  Fix timing calculation bug
+ *	14-Jan-2006  BJD  Allow clock to be stopped when idle
  *
- * $Id: s3c2410.c,v 1.20 2005/11/29 20:01:29 gleixner Exp $
+ * $Id: s3c2410.c,v 1.22 2006/03/15 22:32:08 bjd Exp $
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -36,8 +37,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
-#include <config/mtd/nand/s3c2410/hwecc.h>
-#include <config/mtd/nand/s3c2410/debug.h>
+#include <linux/config.h>
 
 #ifdef CONFIG_MTD_NAND_S3C2410_DEBUG
 #define DEBUG
@@ -73,6 +73,13 @@ static int hardware_ecc = 1;
 static int hardware_ecc = 0;
 #endif
 
+#ifdef CONFIG_MTD_NAND_S3C2410_CLKSTOP
+static int clock_stop = 1;
+#else
+static const int clock_stop = 0;
+#endif
+
+
 /* new oob placement block for use with hardware ecc generation
  */
 
@@ -135,6 +142,11 @@ static struct s3c2410_platform_nand *to_
 	return dev->dev.platform_data;
 }
 
+static inline int allow_clk_stop(struct s3c2410_nand_info *info)
+{
+	return clock_stop;
+}
+
 /* timing calculations */
 
 #define NS_IN_KHZ 1000000
@@ -231,6 +243,9 @@ static void s3c2410_nand_select_chip(str
 	bit = (info->is_s3c2440) ? S3C2440_NFCONT_nFCE : S3C2410_NFCONF_nFCE;
 	reg = info->regs+((info->is_s3c2440) ? S3C2440_NFCONT:S3C2410_NFCONF);
 
+	if (chip != -1 && allow_clk_stop(info))
+		clk_enable(info->clk);
+
 	cur = readl(reg);
 
 	if (chip == -1) {
@@ -250,6 +265,9 @@ static void s3c2410_nand_select_chip(str
 	}
 
 	writel(cur, reg);
+
+	if (chip == -1 && allow_clk_stop(info))
+		clk_disable(info->clk);
 }
 
 /* command and control functions
@@ -459,8 +477,8 @@ static int s3c2410_nand_remove(struct pl
 	/* free the common resources */
 
 	if (info->clk != NULL && !IS_ERR(info->clk)) {
-		clk_disable(info->clk);
-		clk_unuse(info->clk);
+		if (!allow_clk_stop(info))
+			clk_disable(info->clk);
 		clk_put(info->clk);
 	}
 
@@ -598,7 +616,6 @@ static int s3c24xx_nand_probe(struct pla
 		goto exit_error;
 	}
 
-	clk_use(info->clk);
 	clk_enable(info->clk);
 
 	/* allocate and map the resource */
@@ -672,6 +689,11 @@ static int s3c24xx_nand_probe(struct pla
 			sets++;
 	}
 
+	if (allow_clk_stop(info)) {
+		dev_info(&pdev->dev, "clock idle support enabled\n");
+		clk_disable(info->clk);
+	}
+
 	pr_debug("initialised ok\n");
 	return 0;
 
@@ -683,6 +705,41 @@ static int s3c24xx_nand_probe(struct pla
 	return err;
 }
 
+/* PM Support */
+#ifdef CONFIG_PM
+
+static int s3c24xx_nand_suspend(struct platform_device *dev, pm_message_t pm)
+{
+	struct s3c2410_nand_info *info = platform_get_drvdata(dev);
+
+	if (info) {
+		if (!allow_clk_stop(info))
+			clk_disable(info->clk);
+	}
+
+	return 0;
+}
+
+static int s3c24xx_nand_resume(struct platform_device *dev)
+{
+	struct s3c2410_nand_info *info = platform_get_drvdata(dev);
+
+	if (info) {
+		clk_enable(info->clk);
+		s3c2410_nand_inithw(info, dev);
+
+		if (allow_clk_stop(info))
+			clk_disable(info->clk);
+	}
+
+	return 0;
+}
+
+#else
+#define s3c24xx_nand_suspend NULL
+#define s3c24xx_nand_resume NULL
+#endif
+
 /* driver device registration */
 
 static int s3c2410_nand_probe(struct platform_device *dev)
@@ -698,6 +755,8 @@ static int s3c2440_nand_probe(struct pla
 static struct platform_driver s3c2410_nand_driver = {
 	.probe		= s3c2410_nand_probe,
 	.remove		= s3c2410_nand_remove,
+	.suspend	= s3c24xx_nand_suspend,
+	.resume		= s3c24xx_nand_resume,
 	.driver		= {
 		.name	= "s3c2410-nand",
 		.owner	= THIS_MODULE,
@@ -707,6 +766,8 @@ static struct platform_driver s3c2410_na
 static struct platform_driver s3c2440_nand_driver = {
 	.probe		= s3c2440_nand_probe,
 	.remove		= s3c2410_nand_remove,
+	.suspend	= s3c24xx_nand_suspend,
+	.resume		= s3c24xx_nand_resume,
 	.driver		= {
 		.name	= "s3c2440-nand",
 		.owner	= THIS_MODULE,