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| author | Baruch Siach <baruch@tkos.co.il> | 2014-01-25 22:36:14 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-01-27 18:44:35 +0000 |
| commit | 18cc0adb132b390d026c574deec29bf182aede51 (patch) | |
| tree | 605f8c65d7d23d3b4b8a17595a905bd07992a821 | |
| parent | 6e5f52674ff0756e61a8879f6232b9ac33735cba (diff) | |
| download | lwn-18cc0adb132b390d026c574deec29bf182aede51.tar.gz lwn-18cc0adb132b390d026c574deec29bf182aede51.zip | |
spi: document the transfer_one spi_master callback
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Mark Brown <broonie@linaro.org>
| -rw-r--r-- | Documentation/spi/spi-summary | 15 |
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) |