dev_driver_string - Return a deviceAqs driver name, if at all possible

const char * dev_driver_string(const struct device *  dev );

dev
    struct device to get the name of

Will return the deviceAqs driverAqs name if it is bound to a device. If the device is not bound to a driver, it will return the name of the bus it is attached to. If it is not attached to a bus either, an empty string will be returned.