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spi: Clarify transfer_one() w.r.t. spi_finalize_current_transfer()

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Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Geert Uytterhoeven 2014-01-21 16:10:06 +01:00 • committed by Mark Brown
commit 0516712c65
1 changed files with 6 additions and 4 deletions
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10
include/linux/spi/spi.h
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@ -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, * @prepare_message: set up the controller to transfer a single message,
* for example doing DMA mapping. Called from threaded * for example doing DMA mapping. Called from threaded
* context. * context.
* @transfer_one: transfer a single spi_transfer. When the * @transfer_one: transfer a single spi_transfer.
* driver is finished with this transfer it must call * - return 0 if the transfer is finished,
* spi_finalize_current_transfer() so the subsystem can issue * - return 1 if the transfer is still in progress. When
* the next transfer * 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(). * @unprepare_message: undo any work done by prepare_message().
* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS * @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 * number. Any individual value may be -ENOENT for CS lines that