[ARM] 4795/1: S3C244X: Add armclk and setparent call

Add armclk to the supported clocks on the S3C2440 and S3C2442 to
better represent the DVS state which controls whether FCLK or HCLK
is fed to the ARM core.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 37 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c24xx/s3c244x-clock.c b/arch/arm/plat-s3c24xx/s3c244x-clock.c
index 0bf5e7f..faf3e0f 100644
--- a/arch/arm/plat-s3c24xx/s3c244x-clock.c
+++ b/arch/arm/plat-s3c24xx/s3c244x-clock.c
@@ -44,15 +44,52 @@
 #include <asm/plat-s3c24xx/clock.h>
 #include <asm/plat-s3c24xx/cpu.h>
 
+static int s3c2440_setparent_armclk(struct clk *clk, struct clk *parent)
+{
+	unsigned long camdivn;
+	unsigned long dvs;
+
+	if (parent == &clk_f)
+		dvs = 0;
+	else if (parent == &clk_h)
+		dvs = S3C2440_CAMDIVN_DVSEN;
+	else
+		return -EINVAL;
+
+	clk->parent = parent;
+
+	camdivn  = __raw_readl(S3C2440_CAMDIVN);
+	camdivn &= ~S3C2440_CAMDIVN_DVSEN;
+	camdivn |= dvs;
+	__raw_writel(camdivn, S3C2440_CAMDIVN);
+
+	return 0;
+}
+
+static struct clk clk_arm = {
+	.name		= "armclk",
+	.id		= -1,
+	.set_parent	= s3c2440_setparent_armclk,
+};
+
 static int s3c244x_clk_add(struct sys_device *sysdev)
 {
 	unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
 	unsigned long clkdivn;
 	struct clk *clock_upll;
+	int ret;
 
 	printk("S3C244X: Clock Support, DVS %s\n",
 	       (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
 
+	clk_arm.parent = (camdivn & S3C2440_CAMDIVN_DVSEN) ? &clk_h : &clk_f;
+
+	ret = s3c24xx_register_clock(&clk_arm);
+	if (ret < 0) {
+		printk(KERN_ERR "S3C24XX: Failed to add armclk (%d)\n", ret);
+		return ret;
+	}
+
 	clock_upll = clk_get(NULL, "upll");
 	if (IS_ERR(clock_upll)) {
 		printk(KERN_ERR "S3C244X: Failed to get upll clock\n");