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| author | Geert Uytterhoeven <geert+renesas@linux-m68k.org> | 2014-01-21 16:10:06 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-01-21 18:11:49 +0000 |
| commit | 0516712c6548e252adf7aebf70d67842cd734483 (patch) | |
| tree | a66d4dc490eba81bc38f0e6c597201739c555869 /include | |
| parent | 9e8f4882cc49205a688b616c1b6c17bade10587f (diff) | |
| download | linux-stable-0516712c6548e252adf7aebf70d67842cd734483.tar.gz linux-stable-0516712c6548e252adf7aebf70d67842cd734483.tar.bz2 linux-stable-0516712c6548e252adf7aebf70d67842cd734483.zip | |
spi: Clarify transfer_one() w.r.t. spi_finalize_current_transfer()
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/spi/spi.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 8c62ba74dd91..e766e0e2fe58 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -282,10 +282,12 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * @prepare_message: set up the controller to transfer a single message, * for example doing DMA mapping. Called from threaded * context. - * @transfer_one: transfer a single spi_transfer. When the - * driver is finished with this transfer it must call - * spi_finalize_current_transfer() so the subsystem can issue - * the next transfer + * @transfer_one: transfer a single spi_transfer. + * - return 0 if the transfer is finished, + * - 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 * @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 |