Enable UART after driver removal without reboot

Enable UART after driver removal without reboot

[Ayush Singh]

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Hello everyone.

I have a Linux Serdev driver [1] that uses a specific UART. To actually 
access the UART directly (`/dev/ttyS4`), I have to enable a device tree 
[2] and reboot the device. I was wondering if there was a better way to 
go about it.

Is it possible to disable bcfserial (thereby enabling `/dev/ttyS4`) when 
the driver is removed (using rmmod)? I need access to `/dev/ttyS4` to 
flash new firmware to BeaglePlay CC1352 using bsl [3]. Having to restart 
everytime I or anyone else wants to update firmware is not great, while 
developing.

I am looking for a cycle like this: `rmmod driver` -> `flash firmware` 
-> `modprobe driver`.


Ayush Singh


[1]: 
https://git.beagleboard.org/gsoc/greybus/beagleplay-greybus-driver/-/tree/develop

[2]: 
https://git.beagleboard.org/beagleboard/linux/-/blob/v5.10.168-ti-arm64-r108/arch/arm64/boot/dts/ti/overlays/k3-am625-beagleplay-bcfserial-no-firmware.dts

[3]: 
https://git.beagleboard.org/beagleconnect/zephyr/zephyr/-/blob/sdk-next/boards/arm/beagle_play_cc1352/cc2538-bsl.py 


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