Duncan Laurie uploaded patch set #4 to this change.

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intel/common/pmc: Add functions for IPC mailbox in ACPI

This change adds two functions that provide an IPC mailbox
method via ACPI for runtime clock configuration.

pmc_acpi_fill_ssdt_ipc_write_method() will provide a method
in the SSDT that can be called by other ACPI devices to send
an IPC mailbox command.  This function is exported because
some SOCs override the default PMC device and need to call
this function to write the method into the SSDT.

pmc_acpi_set_pci_clock() will call the method defined by the
previous function to enable or disable the PCIe SRCCLK for
a specified root port and clock pin.  It can be called by the
PCIe root port after turning off power to the attached device.

BUG=b:160996445
TEST=boot on volteer device and disassemble the SSDT to
ensure that this method exists.

Signed-off-by: Duncan Laurie <dlaurie@google.com>
Change-Id: I95f5a1ba2bc6905e0f8ce0e8b2342ad1287a23a0
---
M src/soc/intel/common/block/include/intelblocks/pmc.h
M src/soc/intel/common/block/pmc/Kconfig
M src/soc/intel/common/block/pmc/Makefile.inc
A src/soc/intel/common/block/pmc/pmc_ipc.c
4 files changed, 159 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/59/46259/4

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