So I used the Windows Media Creation tool to generate a more recent ISO
which resulted in a date stamp of July-16.  Using this Win10Pro image my
TPM is now recognised by the TPM Administrator, I re-tested my older ISO
in the same guest and this still had the problem so conclusive enough
for me.

Still using 2.7.0 git tag built from source tree

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https://bugs.launchpad.net/bugs/1615823

Title:
  Windows 10 reports no compatible TPM found yet device manager shows
  it?

Status in QEMU:
  New

Bug description:
  Ubuntu 16.04 with stock kvm, libvirt, ovmf
  Qemu 2.5 installed from stock ubuntu ppa
  Qemu 2.6.1 built from tarball.
  Qemu 2.7.0-rc4 built from tarball.

  Windows 10 guest reports a TPM device is installed and the driver
  functional under Device Manager-->Security Devices.  TPM Administrator
  however advises no compatible TPM chip can be found.

  Qemu 2.5 is buggy and prevents the guest loading the TPM driver, this
  was addressed by
  
http://git.qemu.org/?p=qemu.git;a=commit;h=2b1c2e8e5f1990f0a201a8cbf9d366fca60f4aa8

  Have tested the below cmd out on both qemu-2.6.1 and qemu-2.7.0-rc4,
  both suffer the same problem.  My TPM is most certainly compatible as
  installing Win10Pro onto the same host as bare metal provides me the
  desired and expected functionality aka Bitlocker and TPM Administrator
  work.

  sudo ./qemu-system-x86_64 \
  -enable-kvm \
  -machine q35 \
  -cpu host \
  -m 4096 \
  -smp 4,sockets=1,cores=2,threads=2 \
  -device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e \
  -device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 \
  -device 
qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=16,bus=pcie.0,addr=0x2
 \
  -drive file=/usr/share/qemu/OVMF.fd,if=pflash,format=raw,unit=0,readonly=on \
  -drive file=/mnt/120GB_SSD/wintpm_VARS.fd,if=pflash,format=raw,unit=1 \
  -drive 
file=/mnt/120GB_SSD/wintpm.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 \
  -device 
virtio-blk-pci,scsi=off,bus=pci.2,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=2
 \
  -drive file="/mnt/share/Filestorage/Images/Microsoft Windows 10 Pro 
x64.iso",format=raw,if=none,media=cdrom,id=drive-sata0-0-0,readonly=on \
  -device ide-cd,bus=ide.0,drive=drive-sata0-0-0,id=sata0-0-0 \
  -drive 
file=/mnt/share/Filestorage/Images/virtio-win-0.1.117.iso,format=raw,if=none,media=cdrom,id=drive-sata0-0-1,readonly=on
 \
  -device ide-cd,bus=ide.1,drive=drive-sata0-0-1,id=sata0-0-1 \
  -tpmdev 
passthrough,id=tpm-tpm0,path=/dev/tpm0,cancel-path=/sys/class/tpm/tpm0/device/cancel
 \
  -device tpm-tis,tpmdev=tpm-tpm0,id=tpm0

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