[PATCH 1/6] dmaengine: introduce is_slave_xfer function

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

This function helps to distinguish the slave type of transfer by checking the
direction parameter.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
---
 include/linux/dmaengine.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 6402b18..3e1a9026 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -618,6 +618,11 @@ static inline int dmaengine_slave_config(struct dma_chan *chan,
 			(unsigned long)config);
 }
 
+static inline bool is_slave_xfer(enum dma_transfer_direction direction)
+{
+	return (direction == DMA_MEM_TO_DEV) || (direction == DMA_DEV_TO_MEM);
+}
+
 static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
 	struct dma_chan *chan, dma_addr_t buf, size_t len,
 	enum dma_transfer_direction dir, unsigned long flags)
-- 
1.7.10.4