Here 
https://forum.armbian.com/topic/7233-bananapi-pro-7-touchlcd-with-debian-buster-and-mainline-kernel-5xxxx/
 you 
have step by step guide for 7" which is almost identical display.

Dne ponedeljek, 06. april 2020 01.00.25 UTC+2 je oseba destroyedlolo 
napisala:
>
> Hello,
>
> I'm trying to upgrade my BananaPI to latest 5.x kernel. Unfortunately, it 
> doesn't support 3.5 LCD display as per it's DTS.
>
> A found a patch from Paul Kocialkowski : 
> https://lkml.org/lkml/2018/11/7/980
> But despite responses saying patches have been committed, as said the DTS 
> doesn't contain LCD entries and I can even apply sources code :
> As example, in drivers/gpu/drm/sun4i/sun4i_tcon.c some patch's code are 
> included but some other not :(
>
> How can I provide support to this LCD screen ?
>
> Thanks
>
> Laurent
>

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