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>
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@ -282,10 +282,12 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
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* @prepare_message: set up the controller to transfer a single message,
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* for example doing DMA mapping. Called from threaded
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* context.
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* @transfer_one: transfer a single spi_transfer. When the
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* driver is finished with this transfer it must call
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* spi_finalize_current_transfer() so the subsystem can issue
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* the next transfer
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* @transfer_one: transfer a single spi_transfer.
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* - return 0 if the transfer is finished,
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* - return 1 if the transfer is still in progress. When
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* the driver is finished with this transfer it must
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* call spi_finalize_current_transfer() so the subsystem
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* can issue the next transfer
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* @unprepare_message: undo any work done by prepare_message().
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* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
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* number. Any individual value may be -ENOENT for CS lines that
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