1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 #ifndef _UAPI_SPI_H 3 #define _UAPI_SPI_H 4 5 #include <linux/const.h> 6 7 #define SPI_CPHA _BITUL(0) /* clock phase */ 8 #define SPI_CPOL _BITUL(1) /* clock polarity */ 9 10 #define SPI_MODE_0 (0|0) /* (original MicroWire) */ 11 #define SPI_MODE_1 (0|SPI_CPHA) 12 #define SPI_MODE_2 (SPI_CPOL|0) 13 #define SPI_MODE_3 (SPI_CPOL|SPI_CPHA) 14 #define SPI_MODE_X_MASK (SPI_CPOL|SPI_CPHA) 15 16 #define SPI_CS_HIGH _BITUL(2) /* chipselect active high? */ 17 #define SPI_LSB_FIRST _BITUL(3) /* per-word bits-on-wire */ 18 #define SPI_3WIRE _BITUL(4) /* SI/SO signals shared */ 19 #define SPI_LOOP _BITUL(5) /* loopback mode */ 20 #define SPI_NO_CS _BITUL(6) /* 1 dev/bus, no chipselect */ 21 #define SPI_READY _BITUL(7) /* slave pulls low to pause */ 22 #define SPI_TX_DUAL _BITUL(8) /* transmit with 2 wires */ 23 #define SPI_TX_QUAD _BITUL(9) /* transmit with 4 wires */ 24 #define SPI_RX_DUAL _BITUL(10) /* receive with 2 wires */ 25 #define SPI_RX_QUAD _BITUL(11) /* receive with 4 wires */ 26 #define SPI_CS_WORD _BITUL(12) /* toggle cs after each word */ 27 #define SPI_TX_OCTAL _BITUL(13) /* transmit with 8 wires */ 28 #define SPI_RX_OCTAL _BITUL(14) /* receive with 8 wires */ 29 #define SPI_3WIRE_HIZ _BITUL(15) /* high impedance turnaround */ 30 #define SPI_RX_CPHA_FLIP _BITUL(16) /* flip CPHA on Rx only xfer */ 31 #define SPI_MOSI_IDLE_LOW _BITUL(17) /* leave mosi line low when idle */ 32 33 /* 34 * All the bits defined above should be covered by SPI_MODE_USER_MASK. 35 * The SPI_MODE_USER_MASK has the SPI_MODE_KERNEL_MASK counterpart in 36 * 'include/linux/spi/spi.h'. The bits defined here are from bit 0 upwards 37 * while in SPI_MODE_KERNEL_MASK they are from the other end downwards. 38 * These bits must not overlap. A static assert check should make sure of that. 39 * If adding extra bits, make sure to increase the bit index below as well. 40 */ 41 #define SPI_MODE_USER_MASK (_BITUL(18) - 1) 42 43 #endif /* _UAPI_SPI_H */ 44