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https://gitee.com/bianbu-linux/linux-6.6
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d962608ce2
Transmit/receive only is a valid SPI mode. For example, the MOSI/TX line might be missing from an ADC while for a DAC the MISO/RX line may be optional. This patch adds these two new modes: SPI_NO_TX and SPI_NO_RX. This way, the drivers will be able to identify if any of these two lines is missing and to adjust the transfers accordingly. Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Link: https://lore.kernel.org/r/20201221152936.53873-2-alexandru.ardelean@analog.com Signed-off-by: Mark Brown <broonie@kernel.org>
41 lines
1.7 KiB
C
41 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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#ifndef _UAPI_SPI_H
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#define _UAPI_SPI_H
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#include <linux/const.h>
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#define SPI_CPHA _BITUL(0) /* clock phase */
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#define SPI_CPOL _BITUL(1) /* clock polarity */
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#define SPI_MODE_0 (0|0) /* (original MicroWire) */
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#define SPI_MODE_1 (0|SPI_CPHA)
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#define SPI_MODE_2 (SPI_CPOL|0)
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#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
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#define SPI_MODE_X_MASK (SPI_CPOL|SPI_CPHA)
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#define SPI_CS_HIGH _BITUL(2) /* chipselect active high? */
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#define SPI_LSB_FIRST _BITUL(3) /* per-word bits-on-wire */
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#define SPI_3WIRE _BITUL(4) /* SI/SO signals shared */
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#define SPI_LOOP _BITUL(5) /* loopback mode */
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#define SPI_NO_CS _BITUL(6) /* 1 dev/bus, no chipselect */
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#define SPI_READY _BITUL(7) /* slave pulls low to pause */
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#define SPI_TX_DUAL _BITUL(8) /* transmit with 2 wires */
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#define SPI_TX_QUAD _BITUL(9) /* transmit with 4 wires */
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#define SPI_RX_DUAL _BITUL(10) /* receive with 2 wires */
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#define SPI_RX_QUAD _BITUL(11) /* receive with 4 wires */
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#define SPI_CS_WORD _BITUL(12) /* toggle cs after each word */
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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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/*
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* All the bits defined above should be covered by SPI_MODE_USER_MASK.
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* The SPI_MODE_USER_MASK has the SPI_MODE_KERNEL_MASK counterpart in
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* 'include/linux/spi/spi.h'. The bits defined here are from bit 0 upwards
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* while in SPI_MODE_KERNEL_MASK they are from the other end downwards.
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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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#endif /* _UAPI_SPI_H */
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