diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
index 0839b70f0261d33defe472a15cf7aecdb6b9f72d..81b8cad86d1705526950299f1f0ce829609c5f7b 100644
--- a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
+++ b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
@@ -69,6 +69,7 @@ Optional properties:
     reg is the GPR register offset.
     shift is the bit position inside the GPR register.
     val is the value of the bit (0 or 1).
+- fsl,ratio-1-1: AHB/SDMA core clock ration 1:1, 2:1 without this.
 
 Examples:
 
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 97bb4630b9c9835b8c24e07d7e3490f0bc9f2274..ebfc585db4ca4cdd8914201b11af8af45c097c18 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -462,6 +462,8 @@ struct sdma_engine {
 	struct sdma_buffer_descriptor	*bd0;
 	bool				suspend_off;
 	int				idx;
+	/* clock ration for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/
+	bool				clk_ratio;
 };
 
 static struct sdma_driver_data sdma_imx31 = {
@@ -2175,7 +2177,10 @@ static int sdma_init(struct sdma_engine *sdma)
 
 	/* Set bits of CONFIG register but with static context switching */
 	/* FIXME: Check whether to set ACR bit depending on clock ratios */
-	writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
+	if (sdma->clk_ratio)
+		writel_relaxed(SDMA_H_CONFIG_ACR, sdma->regs + SDMA_H_CONFIG);
+	else
+		writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
 
 	writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR);
 
@@ -2268,6 +2273,8 @@ static int sdma_probe(struct platform_device *pdev)
 	if (!sdma)
 		return -ENOMEM;
 
+	sdma->clk_ratio = of_property_read_bool(np, "fsl,ratio-1-1");
+
 	spin_lock_init(&sdma->channel_0_lock);
 
 	sdma->dev = &pdev->dev;