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Linux/PROCESSOR-SDK-AM335X: 4DCAPE-70T device tree

Isaac Sutherland
Prodigy 110 points
Part Number: PROCESSOR-SDK-AM335X

Tool/software: Linux

I recently used buildroot to build the TI v4.1.6 kernel; however, it does not recognize my 4DCAPE-70T display. Where can I find the appropriate device tree file to enable support for my 4DCAPE-70T? I'm new to building embedded systems, so the more detailed a recipe you can give the better my chances of success.

I found this thread (https://e2e.ti.com/support/arm/sitara_arm/f/791/p/467559/1680149) which seems to recommend that the OP should start with a 3.x device tree and modify it for the 4.1 kernel. I'm hoping someone has already done this for the 4DCAPE-70T, and if not, someone can point me to some good resources to learn to do it myself.

  • 0
    TI__Guru**** 393215 points
    The software team have been notified. They will respond here.
  • 0 in reply to Biser Gatchev-XID
    TI__Guru 55345 points

    Hello Isaac,

    I've already done this work. Here is the dts.
    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/am335x_2D00_boneblack.dts

    Best regards,
    Kemal

  • 0 in reply to Kemal R. Shakir
    Prodigy 110 points

    Thanks Kemal, that dts works great to bring up the 4DCAPE-70CT with the buildroot 2017.05 tag and a tweaked version of the beaglebone_qt5_defconfig (which uses the TI kernel v4.1.6).

    (I should clarify that I haven't tested the touchscreen interface successfully yet, but I'm assuming that's just because I haven't enabled the touchscreen driver in buildroot yet.)

    Is that dts going to make it into the TI processor SDK sometime? or some other official public device tree source repository?

    Regards,
    Isaac

  • 0 in reply to Isaac Sutherland
    Prodigy 110 points

    Unfortunately, I've just determined that since my device is a 4DCAPE-70CT it contains a capacitive touch controller and requires a different driver than the 4DCAPE-70T (I had wrongly assumed the drivers would be the same).

    I've opened a ticket with 4D Systems to request driver information for the touchscreen interface. I thought I would post here in the off-chance that someone can help me with a device tree for the FocalTech capacitive touch interface on the AM335X processor