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-rw-r--r--Documentation/dmaengine/provider.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/dmaengine/provider.txt b/Documentation/dmaengine/provider.txt
index 2c391cfe37eb..05d2280190f1 100644
--- a/Documentation/dmaengine/provider.txt
+++ b/Documentation/dmaengine/provider.txt
@@ -310,6 +310,10 @@ supported.
- Even though that structure contains a direction field, this
field is deprecated in favor of the direction argument given to
the prep_* functions
+ - This call is mandatory for slave operations only. This should NOT be
+ set or expected to be set for memcpy operations.
+ If a driver support both, it should use this call for slave
+ operations only and not for memcpy ones.
* device_pause
- Pauses a transfer on the channel