dmaengine: mxs-dma: Let the core do the device node validation

Let the DMA engine core do the device node validation instead of drivers.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/mxs-dma.c

@@ -716,7 +716,6 @@ static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
 }
 
 struct mxs_dma_filter_param {
-	struct device_node *of_node;
 	unsigned int chan_id;
 };
 
@@ -727,9 +726,6 @@ static bool mxs_dma_filter_fn(struct dma_chan *chan, void *fn_param)
 	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
 	int chan_irq;
 
-	if (mxs_dma->dma_device.dev->of_node != param->of_node)
-		return false;
-
 	if (chan->chan_id != param->chan_id)
 		return false;
 
@@ -752,13 +748,13 @@ static struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec,
 	if (dma_spec->args_count != 1)
 		return NULL;
 
-	param.of_node = ofdma->of_node;
 	param.chan_id = dma_spec->args[0];
 
 	if (param.chan_id >= mxs_dma->nr_channels)
 		return NULL;
 
-	return dma_request_channel(mask, mxs_dma_filter_fn, &param);
+	return __dma_request_channel(&mask, mxs_dma_filter_fn, &param,
+				     ofdma->of_node);
 }
 
 static int __init mxs_dma_probe(struct platform_device *pdev)