[RFC PATCH v3 09/16] dmaengine: add dma_request_slave_channel_compat()

From: Matt Porter
Date: Thu Oct 18 2012 - 09:29:22 EST

Adds a dma_request_slave_channel_compat() wrapper which accepts
both the arguments from dma_request_channel() and
dma_request_slave_channel(). Based on whether the driver is
instantiated via DT, the appropriate channel request call will be

This allows for a much cleaner migration of drivers to the
dmaengine DT API as platforms continue to be mixed between those
that boot using DT and those that do not.

Suggested-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Matt Porter <mporter@xxxxxx>
include/linux/dmaengine.h | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index c88f302..11d9e25 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1007,6 +1007,16 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx);
struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type);
struct dma_chan *net_dma_find_channel(void);
#define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y)
+static inline struct dma_chan
+*dma_request_slave_channel_compat(dma_cap_mask_t mask, dma_filter_fn fn,
+ void *fn_param, struct device *dev,
+ char *name)
+ if (dev->of_node)
+ return dma_request_slave_channel(dev, name);
+ else
+ return dma_request_channel(mask, fn, fn_param);

/* --- Helper iov-locking functions --- */


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