linux/spi/spi.h

1055 struct spi_transfer {  struct
1061 	const void	*tx_buf;
1062 	void		*rx_buf;
1063 	unsigned	len;
1067 	u16		error;
1069 	bool		tx_sg_mapped;
1070 	bool		rx_sg_mapped;
1072 	struct sg_table tx_sg;
1073 	struct sg_table rx_sg;
1074 	dma_addr_t	tx_dma;
1075 	dma_addr_t	rx_dma;
1077 	unsigned	dummy_data:1;
1078 	unsigned	cs_off:1;
1079 	unsigned	cs_change:1;
1080 	unsigned	tx_nbits:4;
1081 	unsigned	rx_nbits:4;
1082 	unsigned	timestamped:1;
1087 	u8		bits_per_word;
1088 	struct spi_delay	delay;
1089 	struct spi_delay	cs_change_delay;
1090 	struct spi_delay	word_delay;
1091 	u32		speed_hz;
1093 	u32		effective_speed_hz;
1096 	unsigned int	offload_flags;
1098 	unsigned int	ptp_sts_word_pre;
1099 	unsigned int	ptp_sts_word_post;
1101 	struct ptp_system_timestamp *ptp_sts;
1126  * each represented by a struct spi_transfer.  The sequence is "atomic"  argument