SW_I2C_BUSY_ADDR
ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &b);
ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);