[PATCH v7 07/10] dmaengine: add dma_request_slave_channel_compat()

Matt Porter
2013-02-01T18:22:52Z

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
made.

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-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Matt Porter <mporter-l0cyMroinI0@public.gmane.org>
Acked-by: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
Acked-by: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
---
include/linux/dmaengine.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index bfcdecb..17d8ffd 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1001,6 +1001,22 @@ 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)
+#define dma_request_slave_channel_compat(mask, x, y, dev, name) \
+ __dma_request_slave_channel_compat(&(mask), x, y, dev, name)
+
+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)
+{
+ struct dma_chan *chan;
+
+ chan = dma_request_slave_channel(dev, name);
+ if (chan)
+ return chan;
+
+ return __dma_request_channel(mask, fn, fn_param);
+}

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

--
1.7.9.5

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