[PATCH 1/4] dmaengine: add DMA_TRANS_NONE to dma_transfer_direction

[shawn.guo@linaro.org (Shawn Guo)]

Before dma_transfer_direction was introduced to replace
dma_data_direction, some dmaengine device uses DMA_NONE of
dma_data_direction for some talk with its client drivers.
The mxs-dma and its clients mxs-mmc and gpmi-nand are such case.

This patch adds DMA_TRANS_NONE to dma_transfer_direction and
migrate the DMA_NONE use in mxs-dma to it.

It also fixes the compile warning below.

CC      drivers/dma/mxs-dma.o
drivers/dma/mxs-dma.c: In function ?mxs_dma_prep_slave_sg?:
drivers/dma/mxs-dma.c:420:16: warning: comparison between ?enum dma_transfer_direction? and ?enum dma_data_direction?

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/dma/mxs-dma.c     |    2 +-
 include/linux/dmaengine.h |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index bdf4672..ff89211 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -417,7 +417,7 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
 		idx = 0;
 	}
 
-	if (direction == DMA_NONE) {
+	if (direction == DMA_TRANS_NONE) {
 		ccw = &mxs_chan->ccw[idx++];
 		pio = (u32 *) sgl;
 
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 5532bb8..679b349 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -88,6 +88,7 @@ enum dma_transfer_direction {
 	DMA_MEM_TO_DEV,
 	DMA_DEV_TO_MEM,
 	DMA_DEV_TO_DEV,
+	DMA_TRANS_NONE,
 };
 
 /**
-- 
1.7.4.1