sifive_spi_read
u32 ip = sifive_spi_read(spi, SIFIVE_SPI_REG_IP);
cr = sifive_spi_read(spi, SIFIVE_SPI_REG_IP);
WARN_ON_ONCE((sifive_spi_read(spi, SIFIVE_SPI_REG_TXDATA)
u32 data = sifive_spi_read(spi, SIFIVE_SPI_REG_RXDATA);
spi->cs_inactive = sifive_spi_read(spi, SIFIVE_SPI_REG_CSDEF);
cs_bits = sifive_spi_read(spi, SIFIVE_SPI_REG_CSDEF);