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Kernels (3.15+) introduce the possibility to do DUAL and QUAD spi
operations via spidev.
Prior to this commit nothing was setting the {tx,rx}_nbits members
of the struct spi_ioc_transfer.
from include/uapi/linux/spi/spidev.h
struct spi_ioc_transfer {
__u64 tx_buf;
__u64 rx_buf;
__u32 len;
__u32 speed_hz;
__u16 delay_usecs;
__u8 bits_per_word;
__u8 cs_change;
__u8 tx_nbits;
__u8 rx_nbits;
__u16 pad;
};
This turns into an issue on more recent kernels,
where it turns all transactions into QUAD transactions,
while the controller actually doesn't support that mode of
operation.
Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
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