Compiling a Raspberry Pi LCD Device Driver (Device Tree) - How?

[pavel-demin]

Compiling a Raspberry Pi LCD Device Driver (Device Tree) - How?

[pavel-demin]

I'd follow the instructions from fbtft/README:

cd drivers/video/fbdev
git clone https://github.com/notro/fbtft.git
Add to drivers/video/fbdev/Kconfig: source "drivers/video/fbdev/fbtft/Kconfig"
Add to drivers/video/fbdev/Makefile: obj-y += fbtft/

Hello Pavel - I am assuming that I need to make some updates to the Device Tree (since it is for the Raspberry Pi). Is this thinking correct?

[pavel-demin]

Sorry, but I have no idea how to make this driver working with Red Pitaya. Why not read the driver documentation or ask the authors of the driver?

[pavel-demin]

I've just realized that your question was already answered on the Red Pitaya forum:
http://forum.redpitaya.com/viewtopic.php?t=1409&p=5580#p5580

I don't think that I can add anything to this answer.

There may be other Raspberry Pi device drivers I would want to move over, so understanding the Device Tree mappings and then rebuilding the kernel were things I was poking at.

I think I have a working plan of how to migrate this driver from a Raspberry Pi to the Red Pitaya. Since I used the build environment from your tree, I wanted to make sure I was on the right track. I will update this thread if all goes well.

[pavel-demin]

I had a quick look at the fbtft documentation and found a solution based on the devicetree overlays:
https://github.com/notro/fbtft/wiki/FBTFT-RPI-overlays

Some more information about devicetree overlays can be found at the following link:
https://www.raspberrypi.org/documentation/configuration/device-tree.md

I also found the fbtft driver in drivers/staging/fbtft.

I enabled devicetree overlays and all the fbtft components with commit f0742db.

Thanks Pavel, I am reading this and the Xilinx SPI documentation: http://www.wiki.xilinx.com/Linux+SPI+Driver