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/
usr
/
include
/
linux
/
spi
/ [
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]
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spi.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ #ifndef _SPI_H #define _SPI_H #include <linux/const.h> #define SPI_CPHA _BITUL(0) /* clock phase */ #define SPI_CPOL _BITUL(1) /* clock polarity */ #define SPI_MODE_0 (0|0) /* (original MicroWire) */ #define SPI_MODE_1 (0|SPI_CPHA) #define SPI_MODE_2 (SPI_CPOL|0) #define SPI_MODE_3 (SPI_CPOL|SPI_CPHA) #define SPI_MODE_X_MASK (SPI_CPOL|SPI_CPHA) #define SPI_CS_HIGH _BITUL(2) /* chipselect active high? */ #define SPI_LSB_FIRST _BITUL(3) /* per-word bits-on-wire */ #define SPI_3WIRE _BITUL(4) /* SI/SO signals shared */ #define SPI_LOOP _BITUL(5) /* loopback mode */ #define SPI_NO_CS _BITUL(6) /* 1 dev/bus, no chipselect */ #define SPI_READY _BITUL(7) /* slave pulls low to pause */ #define SPI_TX_DUAL _BITUL(8) /* transmit with 2 wires */ #define SPI_TX_QUAD _BITUL(9) /* transmit with 4 wires */ #define SPI_RX_DUAL _BITUL(10) /* receive with 2 wires */ #define SPI_RX_QUAD _BITUL(11) /* receive with 4 wires */ #define SPI_CS_WORD _BITUL(12) /* toggle cs after each word */ #define SPI_TX_OCTAL _BITUL(13) /* transmit with 8 wires */ #define SPI_RX_OCTAL _BITUL(14) /* receive with 8 wires */ #define SPI_3WIRE_HIZ _BITUL(15) /* high impedance turnaround */ #define SPI_RX_CPHA_FLIP _BITUL(16) /* flip CPHA on Rx only xfer */ #define SPI_MOSI_IDLE_LOW _BITUL(17) /* leave mosi line low when idle */ /* * All the bits defined above should be covered by SPI_MODE_USER_MASK. * The SPI_MODE_USER_MASK has the SPI_MODE_KERNEL_MASK counterpart in * 'include/linux/spi/spi.h'. The bits defined here are from bit 0 upwards * while in SPI_MODE_KERNEL_MASK they are from the other end downwards. * These bits must not overlap. A static assert check should make sure of that. * If adding extra bits, make sure to increase the bit index below as well. */ #define SPI_MODE_USER_MASK (_BITUL(18) - 1) #endif /* _SPI_H */
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