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spi: core: allow defining time that cs is deasserted as a multiple of SCK

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Support setting a delay between cs assert and deassert as
a multiple of spi clock length.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Martin Sperl 2019-02-23 08:49:50 +00:00 • committed by Mark Brown
parent 0ff2de8bb1
commit d5864e5bed
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2 changed files with 9 additions and 0 deletions
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include/linux/spi/spi.h
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@ -831,6 +831,7 @@ struct spi_transfer {
u8 cs_change_delay_unit;
#define SPI_DELAY_UNIT_USECS 0
#define SPI_DELAY_UNIT_NSECS 1
#define SPI_DELAY_UNIT_SCK 2
u32 speed_hz;
u16 word_delay;