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-rw-r--r--Documentation/spi/spi-summary15
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary
index f72e0d1e0da8..dcaad476789c 100644
--- a/Documentation/spi/spi-summary
+++ b/Documentation/spi/spi-summary
@@ -545,6 +545,21 @@ SPI MASTER METHODS
spi_finalize_current_message() so the subsystem can issue the next
transfer. This may sleep.
+ master->transfer_one(struct spi_master *master, struct spi_device *spi,
+ struct spi_transfer *transfer)
+ The subsystem calls the driver to transfer a single transfer while
+ queuing transfers that arrive in the meantime. When the driver is
+ finished with this transfer, it must call
+ spi_finalize_current_transfer() so the subsystem can issue the next
+ transfer. This may sleep. Note: transfer_one and transfer_one_message
+ are mutually exclusive; when both are set, the generic subsystem does
+ not call your transfer_one callback.
+
+ Return values:
+ negative errno: error
+ 0: transfer is finished
+ 1: transfer is still in progress
+
DEPRECATED METHODS
master->transfer(struct spi_device *spi, struct spi_message *message)