LPI2C_MDER
writel(MDER_TDDE | MDER_RDDE, lpi2c_imx->base + LPI2C_MDER);
writel(MDER_TDDE, lpi2c_imx->base + LPI2C_MDER);
writel(0, lpi2c_imx->base + LPI2C_MDER);