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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
spi: add SPI_RX_CPHA_FLIP mode bit
Some SPI devices latch MOSI bits on one clock phase, but produce valid
MISO bits on the other phase. Add SPI_RX_CPHA_FLIP mode to instruct the
controller driver to flip CPHA for Rx (MISO) only transfers.
Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
Link: https://lore.kernel.org/r/a715ca92713ca02071f33dcca9960a66a03c949a.1649702729.git.baruch@tkos.co.il
Signed-off-by: Mark Brown <broonie@kernel.org>
authored by
Baruch Siach
and committed by
Mark Brown
b617be33
4bbaa857
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include/uapi/linux/spi/spi.h
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include/uapi/linux/spi/spi.h
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#define SPI_TX_OCTAL _BITUL(13) /* transmit with 8 wires */
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#define SPI_RX_OCTAL _BITUL(14) /* receive with 8 wires */
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#define SPI_3WIRE_HIZ _BITUL(15) /* high impedance turnaround */
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#define SPI_RX_CPHA_FLIP _BITUL(16) /* flip CPHA on Rx only xfer */
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/*
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* All the bits defined above should be covered by SPI_MODE_USER_MASK.
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* These bits must not overlap. A static assert check should make sure of that.
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* If adding extra bits, make sure to increase the bit index below as well.
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*/
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#define SPI_MODE_USER_MASK (_BITUL(16) - 1)
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#define SPI_MODE_USER_MASK (_BITUL(17) - 1)
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#endif /* _UAPI_SPI_H */