spu_read_u32
err = spu_read_u32(card, IF_SPI_SCRATCH_4_REG, &scratch);
err = spu_read_u32(card, reg, &val);
err = spu_read_u32(card, IF_SPI_DEVICEID_CTRL_REG, &dev_ctrl);
err = spu_read_u32(card, IF_SPI_DELAY_READ_REG, &delay);
err = spu_read_u32(card, IF_SPI_SCRATCH_3_REG, &cause);