soc: it8xxx2: add support for eSPI driver

This supports eSPI slave, virtual wire, and peripheral functions.

Signed-off-by: Dino Li <Dino.Li@ite.com.tw>

drivers/espi/CMakeLists.txt

@@ -10,3 +10,4 @@ zephyr_library_sources_ifdef(CONFIG_ESPI_EMUL		espi_emul.c)
 zephyr_library_sources_ifdef(CONFIG_ESPI_SAF		espi_saf_mchp_xec.c)
 zephyr_library_sources_ifdef(CONFIG_ESPI_XEC_V2		espi_mchp_xec_v2.c)
 zephyr_library_sources_ifdef(CONFIG_ESPI_XEC_V2		espi_mchp_xec_host_v2.c)
+zephyr_library_sources_ifdef(CONFIG_ESPI_IT8XXX2	espi_it8xxx2.c)

drivers/espi/Kconfig

@@ -18,6 +18,8 @@ source "drivers/espi/Kconfig.npcx"
 
 source "drivers/espi/Kconfig.espi_emul"
 
+source "drivers/espi/Kconfig.it8xxx2"
+
 module = ESPI
 module-str = espi
 source "subsys/logging/Kconfig.template.log_config"

drivers/espi/Kconfig.it8xxx2

@@ -0,0 +1,27 @@
+# Copyright (c) 2021 ITE Corporation. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+config ESPI_IT8XXX2
+	bool "ITE IT8XXX2 embedded controller ESPI driver"
+	depends on SOC_IT8XXX2
+	help
+	  Enable ITE IT8XXX2 ESPI driver.
+
+if ESPI_IT8XXX2
+
+config ESPI_PERIPHERAL_8042_KBC
+	default y
+
+config ESPI_PERIPHERAL_HOST_IO
+	default y
+
+config ESPI_PERIPHERAL_DEBUG_PORT_80
+	default y
+
+config ESPI_IT8XXX2_PNPCFG_DEVICE_KBC_MOUSE
+	bool "ITE IT8XXX2 KBC mouse device"
+	help
+	  With this option enabled, EC will send IRQ12 signal to host when the
+	  KBC mouse output buffer is full.
+
+endif #ESPI_IT8XXX2