I2C_SL_CNFG
u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG);
i2c_writel(i2c_dev, sl_cfg, I2C_SL_CNFG);
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);