[PATCH 1/4] DMA: PL330: Add xlate function

[Padmavathi Venna]

Add xlate to translate the device-tree binding information into
the appropriate format. The filter function requires the dma
controller device node and dma channel number as filter_params.

Signed-off-by: Padmavathi Venna <padma.v at samsung.com>
---
 drivers/dma/pl330.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 80680ee..b0a9080 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -25,6 +25,7 @@
 #include <linux/amba/pl330.h>
 #include <linux/scatterlist.h>
 #include <linux/of.h>
+#include <linux/of_dma.h>
 
 #include "dmaengine.h"
 #define PL330_MAX_CHAN		8
@@ -2352,6 +2353,22 @@ static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
 	tasklet_schedule(&pch->task);
 }
 
+struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec,
+						struct of_dma *ofdma)
+{
+	int count = dma_spec->args_count;
+	struct of_dma_filter_info *info = ofdma->of_dma_data;
+
+	if (!info || !info->filter_fn)
+		return NULL;
+
+	if (count != 1)
+		return NULL;
+
+	return dma_request_channel(info->dma_cap, info->filter_fn, dma_spec);
+}
+EXPORT_SYMBOL_GPL(of_dma_pl330_xlate);
+
 bool pl330_filter(struct dma_chan *chan, void *param)
 {
 	u8 *peri_id;
-- 
1.7.4.4