** Also affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-raspi2 (Ubuntu)
Status: New => Won't Fix
** Changed in: linux-raspi (Ubuntu)
Importance: Undecided => Wishlist
** Tags added: kern-2643
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https://bugs.launchpad.net/bugs/1963919
Title:
fbtft overlay is missing
Status in linux-raspi package in Ubuntu:
New
Status in linux-raspi2 package in Ubuntu:
Won't Fix
Bug description:
To attach TFT touchscreens the pi-foundation kernel ships the fbtft
devicetree overlay along with rpi-display.
While you can attach a stand-alone TFT display just fine when only
using rpi-display to provide the drivers with hardcoded GPIO
assignments, it gets extremely tricky to even enable the touchscreen
input or to use such a TFT with other sensors attached since rpi-
display does not allow any re-assignment of the GPIO pins in use.
The upstream fbtft driver can make use of the already included rpi-display
drivers by defining "rpi-display" in its params. It also allows to freely
re-assign the GPIO pins for backlight, D/C and Reset to give you enough
flexibility to have the display co-exist with any attached sensors and touch
input devices that do not have the ability to re-assign GPIO pins and that
clash with the hardcoded numbering of rpi-display.
An example with freely assigned GPIOs can be seen in the upstream
(rpi-foundation) overlay README file at:
https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README#L884
Please include fbtft in the ubuntu kernels to allow a more flexible
usage of SPI based TFT touchscreens on the Pi.
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