I2C_SCL
device->i2c_reg |= I2C_SCL;
device->i2c_reg &= ~I2C_SCL;
return (reg_read32(REG_I2C_CONTROL) & I2C_SCL) >> 1; // I2C_SCL is 0x02
device->i2c_reg |= I2C_SCL | I2C_SDA;