** Also affects: linux-raspi2 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux-raspi2 (Ubuntu Bionic)
   Importance: Undecided => Medium

** Changed in: linux-raspi2 (Ubuntu Bionic)
       Status: New => Confirmed

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  Add devicetree overlay to support the SLB9670 TPM module for RPi

Status in linux-raspi2 package in Ubuntu:
Status in linux-raspi2 source package in Bionic:

Bug description:

   * Currently it is not possible to use the SLB9670 TPM module with
  Ubuntu Core since we do not ship the required devicetree overlay to
  enable it
  and there is no way for snaps to easily add their own devicetree
  overlay. Finally it is not practical to expect Ubuntu Core users to
  have to build and maintain their own kernels just to support a
  particular hardware device.

  For background discussion, refer to this thread on the snapcraft
  forums - https://forum.snapcraft.io/t/guidance-on-snap-interface-to-

   * Once this overlay is added, then users simply need to modify the
  boot config.txt to enable the overlay to be loaded automatically. In
  the future, snapd might also enable support so this can be managed by
  snapd via snap system configuration.

  [Test Case]

   * Boot a RPi with a SLB9670 connected, modify /boot/config.txt to
  specify dtoverlay=tpm-slb9670, then load the tpm_tis_spi module and
  /dev/tpm0 should the be available.

  [Regression Potential]

   * Almost zero chance of regression potential since this is simply
  adding a new overlay to the kernel. This is not loaded automatically
  so there is no real chance of regression.

  [Other Info]
   * All that is required for this SRU is to merge 
 to the current bionic raspi kernel branch.

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