Hi, it looks like the ra8875 driver is included, at least for the
kernel I'm running:

debian@beaglebone:~$ modinfo
/lib/modules/4.16.0-rc2-bone3/kernel/drivers/staging/fbtft/fb_ra8875.ko.xz
filename:
/lib/modules/4.16.0-rc2-bone3/kernel/drivers/staging/fbtft/fb_ra8875.ko.xz
license:        GPL
author:         Pf@nne
description:    FB driver for the RA8875 LCD Controller
alias:          platform:ra8875
alias:          spi:ra8875
alias:          platform:fb_ra8875
alias:          spi:fb_ra8875
alias:          of:N*T*Craio,ra8875C*
alias:          of:N*T*Craio,ra8875
depends:        fbtft
staging:        Y
intree:         Y
name:           fb_ra8875
vermagic:       4.16.0-rc2-bone3 mod_unload modversions ARMv7 p2v8

fyi - I installed that kernel with this command:
sudo /opt/scripts/tools/update_kernel.sh --bone-channel --exp

This page from the fbtft wiki might be of interest:
https://github.com/notro/fbtft/wiki/fbtft_device#parameters

Here is example of the parameters one person uses:
https://github.com/notro/fbtft/issues/476

I'm curious which RA8875 display do you have?

I do support for Adafruit so I could request this one to try it out:
https://www.adafruit.com/product/1590

thanks,
drew

On Wed, Feb 21, 2018 at 9:48 PM, evilwulfie <evilwul...@gmail.com> wrote:
> How would one know if if a particular driver is already build in the bone
> kernel fb_ra8875.c
>
>
> https://git.kernel.org/cgit/linux/kernel/git/gregkh/staging.git/tree/drivers/staging/fbtft?h=staging-testing
>
> root@bone:/home/debian# modinfo fbtft
> filename:
> /lib/modules/4.9.78-ti-r94/kernel/drivers/staging/fbtft/fbtft.ko
> license:        GPL
> depends:
> staging:        Y
> intree:         Y
> vermagic:       4.9.78-ti-r94 SMP preempt mod_unload modversions ARMv7 p2v8
> parm:           debug:override device debug level (ulong)
>
>
> If the driver is already compiled in how would one add it to a device tree
> file for use
>
> spi driven device but no dc pin, first command byte upper bits select either
> a command or data and w/r
>
> kinda a different animal than most tft displays
>
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