I2C_SL_NEWSL
tegra_i2c_writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG);
tegra_i2c_writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG);