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[v2,1/3] spi: spi.h: clarify the documentation of transfer_one

Message ID 598dd86dc07d794d7cd19a3259ea71618ba150bd.1390552232.git.baruch@tkos.co.il (mailing list archive)
State Accepted
Commit 6e5f52674ff0756e61a8879f6232b9ac33735cba
Headers show

Commit Message

Baruch Siach Jan. 24, 2014, 8:36 a.m. UTC 
Explicitly note the transfer_one and transfer_one_message are mutually
exclusive, to make the text a little more newcomers friendly.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
 include/linux/spi/spi.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 9f5242df9311..f5a08c3f3e60 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -287,7 +287,10 @@  static inline void spi_unregister_driver(struct spi_driver *sdrv)
  *                  - return 1 if the transfer is still in progress. When
  *                    the driver is finished with this transfer it must
  *                    call spi_finalize_current_transfer() so the subsystem
- *                    can issue the next transfer
+ *                    can issue the next transfer. Note: transfer_one and
+ *                    transfer_one_message are mutually exclusive; when both
+ *                    are set, the generic subsystem does not call your
+ *                    transfer_one callback.
  * @unprepare_message: undo any work done by prepare_message().
  * @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
  *	number. Any individual value may be -ENOENT for CS lines that