amd_spi_readreg8
u8 tmp = amd_spi_readreg8(amd_spi, idx);
buf[i] = amd_spi_readreg8(amd_spi, fifo_pos + i);
buf[i] = amd_spi_readreg8(amd_spi, base_addr + op->dummy.nbytes +