[RFC PATCH v2 09/16] dmaengine: add dma_request_slave_channel_compat()

Matt Porter mporter at ti.com
Thu Oct 11 15:04:34 EDT 2012

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 at atomide.com>
Signed-off-by: Matt Porter <mporter at ti.com>
 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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