bcm_spi_writeb
bcm_spi_writeb(bs, reg, SPI_CLK_CFG);
bcm_spi_writeb(bs, 0, SPI_INT_MASK);
bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL);
bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
bcm_spi_writeb(bs, 0, SPI_INT_MASK);
bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
bcm_spi_writeb(bs, 0, SPI_INT_MASK);