Public bug reported: 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. ** Affects: linux-raspi2 (Ubuntu) Importance: Wishlist Status: New ** Changed in: linux-raspi2 (Ubuntu) Importance: Undecided => Wishlist ** Description changed: 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 or use a TFT with - other sensors attached since rpi-display does not allow any re- - assignment of the GPIO pins in use. + 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. + 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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1963919 Title: fbtft overlay is missing To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1963919/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
