There is a requirement that the TPM RST signal cannot be asserted by
software. On nissa this is PLT_RST_L, so lock this pin to prevent it
being reconfigured as a GPIO.
BUG=b:216671701
TEST=Try to change GPP_B13 from the kernel:
$ echo 677 > /sys/class/gpio/export
$ echo out > /sys/class/gpio/gpio677/direction
$ echo 0 > /sys/class/gpio/gpio677/value
$ echo 1 > /sys/class/gpio/gpio677/value
GSC console doesn't show "PLT_RST_L ASSERTED" / "PLT_RST_L DEASSERTED"
Change-Id: Id5d64b4b028e4f63c4acb05cd8632d0642866688
Signed-off-by: Reka Norman <rekanorman@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65591
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>
42dae32e6c