ARM: S3C64XX: Use clk_prepare_enable/clk_disable_unprepare in dma.c

This patch modifies s3c64xx DMA driver to prepare and unprepare clocks
in addition to enableind and disabling, since it is required by common
clock framework.
Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Tested-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s3c64xx/dma.c

@@ -677,7 +677,7 @@ static int s3c64xx_dma_init1(int chno, enum dma_ch chbase,
 		goto err_map;
 	}
 
-	clk_enable(dmac->clk);
+	clk_prepare_enable(dmac->clk);
 
 	dmac->regs = regs;
 	dmac->chanbase = chbase;
@@ -711,7 +711,7 @@ static int s3c64xx_dma_init1(int chno, enum dma_ch chbase,
 	return 0;
 
 err_clk:
-	clk_disable(dmac->clk);
+	clk_disable_unprepare(dmac->clk);
 	clk_put(dmac->clk);
 err_map:
 	iounmap(regs);