Christophe Leroy 5e0531f6b9 spi: Add capability to perform some transfer with chipselect off ... Some components require a few clock cycles with chipselect off before or/and after the data transfer done with CS on. Typically IDT 801034 QUAD PCM CODEC datasheet states "Note *: CCLK should have one cycle before CS goes low, and two cycles after CS goes high". The cycles "before" are implicitely provided by all previous activity on the SPI bus. But the cycles "after" must be provided in order to terminate the SPI transfer. In order to use that kind of component, add a cs_off flag to spi_transfer struct. When this flag is set, the transfer is performed with chipselect off. This allows consummer to add a dummy transfer at the end of the transfer list which is performed with chipselect OFF, providing the required additional clock cycles. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Link: https://lore.kernel.org/r/434165c46f06d802690208a11e7ea2500e8da4c7.1662558898.git.christophe.leroy@csgroup.eu Signed-off-by: Mark Brown <broonie@kernel.org>		2022-09-07 15:18:48 +01:00
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ad7877.h
ads7846.h
altera.h
at73c213.h
at86rf230.h
cc2520.h
corgi_lcd.h
ds1305.h
eeprom.h
flash.h
libertas_spi.h
max7301.h
mc33880.h
mmc_spi.h
mxs-spi.h
pxa2xx_spi.h	spi: pxa2xx_spi: Convert to use GPIO descriptors	2022-01-31 15:17:27 +00:00
rspi.h
s3c24xx-fiq.h
s3c24xx.h	spi: s3c24xx: Convert to GPIO descriptors	2022-01-24 13:37:34 +00:00
sh_hspi.h
sh_msiof.h
spi-fsl-dspi.h
spi-mem.h	spi: spi-mem: Add an ecc parameter to the spi_mem_op structure	2022-02-10 09:32:30 +01:00
spi.h	spi: Add capability to perform some transfer with chipselect off	2022-09-07 15:18:48 +01:00
spi_bitbang.h
spi_gpio.h
spi_oc_tiny.h
tdo24m.h
tle62x0.h
xilinx_spi.h