driver: espi: add espi driver for rts5912

boards/realtek/rts5912_evb/rts5912_evb.dts

@@ -71,3 +71,12 @@
 	pinctrl-names = "default";
 	pulses-per-round = <2>;
 };
+
+&espi0 {
+	status = "okay";
+	pinctrl-0 = < &espi_alert_gpio003 &espi_cs_gpio004
+				&espi_io3_gpio005 &espi_io2_gpio006
+				&espi_io1_gpio007 &espi_io0_gpio008
+				&espi_clk_gpio009 &espi_reset_gpio020>;
+	pinctrl-names = "default";
+};

drivers/espi/CMakeLists.txt

@@ -15,3 +15,4 @@ 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)
 zephyr_library_sources_ifdef(CONFIG_ESPI_TAF_XEC_V2	espi_saf_mchp_xec_v2.c)
+zephyr_library_sources_ifdef(CONFIG_ESPI_RTS5912	espi_realtek_rts5912.c)

drivers/espi/Kconfig

@@ -18,6 +18,8 @@ source "drivers/espi/Kconfig.espi_emul"
 
 source "drivers/espi/Kconfig.it8xxx2"
 
+source "drivers/espi/Kconfig.rts5912"
+
 module = ESPI
 module-str = espi
 source "subsys/logging/Kconfig.template.log_config"

drivers/espi/Kconfig.rts5912

@@ -0,0 +1,34 @@
+# Copyright (c) 2025, Realtek, SIBG-SD7
+# SPDX-License-Identifier: Apache-2.0
+
+config ESPI_RTS5912
+	bool "Realtek RTS5912 eSPI Driver"
+	default y
+	depends on DT_HAS_REALTEK_RTS5912_ESPI_ENABLED
+	help
+	  Enable the Realtek RTS5912 eSPI driver.
+
+if ESPI_RTS5912
+
+config ESPI_PERIPHERAL_8042_KBC
+	default y
+
+config ESPI_PERIPHERAL_ACPI_SHM_REGION
+	default y
+
+config ESPI_PERIPHERAL_HOST_IO
+	default y
+
+config ESPI_PERIPHERAL_EC_HOST_CMD
+	default y
+
+config ESPI_PERIPHERAL_DEBUG_PORT_80
+	default y
+
+config ESPI_OOB_CHANNEL
+	default y
+
+config ESPI_FLASH_CHANNEL
+	default y
+
+endif