AR71XX_SPI_REG_CTRL
ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);