tft driver

[evilwulfie]

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

[Drew Fustini]

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

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[Jason Kridner]

To know before installing, the last commit on any of the beagleboard kernels is the defconfig. Pick the kernel branch on github and go to the last commit. 

https://github.com/beagleboard/linux/commit/960d4b4bc998942d0642df2246a79c6cd5e9eb5d

Search for RA8875. 

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