REG_CON_TUNING_MASK
val = i2c_readl(i2c, REG_CON) & REG_CON_TUNING_MASK;
u32 val = i2c_readl(i2c, REG_CON) & REG_CON_TUNING_MASK;
ctrl = i2c_readl(i2c, REG_CON) & REG_CON_TUNING_MASK;
val &= ~REG_CON_TUNING_MASK;