Add a new driver named "switch" for run-time selection of wanted devices in DT based on gpios:

    configuration_switch: configuration_switch {
        compatible = "emcraft,configuration-switch";
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_switch>;
    };

...
    pinctrl_switch: switch {
        st,pins {
            /* e5 = 4*16 + 5 = 69 */
            status_pullup = <&gpioe 5 IN
                PULL_UP PUSH_PULL LOW_SPEED>;
        };
    };

...

&usb_fs {
    ...
    configuration-switch-gpios = <&gpioe 5 GPIO_ACTIVE_LOW>;
};