Change in coreboot[master]: mb/system76/lemp9: enable TPM

[Michael Niewöhner (Code Review)]

Hello  Felix Singer, build bot (Jenkins), Nico Huber, Patrick Georgi, Jeremy Soller, Paul Menzel,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/43641

to look at the new patch set (#17).

Change subject: mb/system76/lemp9: enable TPM
......................................................................

mb/system76/lemp9: enable TPM

L140CU has a TPM2 connected via SPI. Add the TPM device to the
devicetree and enable it.

According to Intel doc#615170-001, PIRQ is required for SPI TPM to work.
Since the TPM is connected to GPP_A7, enable NF1 (PIRQA#) and set it as
TPM interrupt in Kconfig.

Note: The PCH maps either LPC TPM or SPI TPM to the same address and
handles either LPC or SPI communication transparently. Thus we can use
MAINBOARD_HAS_LPC_TPM here, which implements TPM via that address.

Tested, but only polling works currently, because there is some upstream
issue with the tpm_tis module in current Linux kernels. [1]

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1770021

Signed-off-by: Michael Niewöhner 
Change-Id: I26d3b396fe1e99368e18fd3a6a9f02e3585b9f6e
---
M src/mainboard/system76/lemp9/Kconfig
M src/mainboard/system76/lemp9/devicetree.cb
M src/mainboard/system76/lemp9/gpio.h
3 files changed, 14 insertions(+), 16 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/41/43641/17