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# Copyright 2021 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
if PLATFORM_EC_HOSTCMD
choice PLATFORM_EC_HOST_INTERFACE_TYPE
prompt "Select the host interface type"
default PLATFORM_EC_HOST_INTERFACE_ESPI if AP_X86
default PLATFORM_EC_HOST_INTERFACE_SHI if AP_ARM
help
The AP communicates with the EC using one of several host interface
types. The selection of the host interface type is based on the
capability of both the AP and the EC.
x86-compatible application processors typically use the enhanced SPI
(ESPI) interface while other application processors use the SPI host
interface (SHI).
config PLATFORM_EC_HOST_INTERFACE_ESPI
bool "eSPI"
depends on ESPI && AP
help
Enable the Enhanced Serial Peripheral Interface (eSPI) host interface.
eSPI supports a shared physical connection between several on-board
devices, similar to SPI. It adds a few optional signals and a protocol
layer to provide independent 'channels' for each device to communicate
over.
eSPI is the replacement for LPC (Low-Pin-Count bus).
See here for information about eSPI:
https://www.intel.com/content/dam/support/us/en/documents/software/chipset-software/327432-004_espi_base_specification_rev1.0_cb.pdf
config PLATFORM_EC_HOST_INTERFACE_HECI
bool "HECI"
depends on AP
help
Enable the Host Embedded Controller Interface (HECI).
config PLATFORM_EC_HOST_INTERFACE_LPC
bool "LPC"
depends on AP
help
Enable the Low-Pin-Count (LPC) bus.
config PLATFORM_EC_HOST_INTERFACE_SHI
bool "SPI Host Interface"
depends on AP
help
Enable the SPI Host Interface (SHI). This is a traditional SPI (serial
peripheral interface), where the AP is the SPI controller and the EC
is the SPI peripheral.
config PLATFORM_EC_HOST_INTERFACE_USB
bool "USB"
depends on AP
help
Enable the USB host interface.
endchoice # PLATFORM_EC_HOST_INTERFACE_TYPE
endif # PLATFORM_EC_HOSTCMD
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