diff --git a/drivers/espi/Kconfig.rts5912 b/drivers/espi/Kconfig.rts5912
index bb29ce66535..045a18ae32b 100644
--- a/drivers/espi/Kconfig.rts5912
+++ b/drivers/espi/Kconfig.rts5912
@@ -10,6 +10,9 @@ config ESPI_RTS5912
 
 if ESPI_RTS5912
 
+config ESPI_PERIPHERAL_ACPI_SHM_REGION
+	default y
+
 config ESPI_PERIPHERAL_HOST_IO
 	default y
 
diff --git a/drivers/espi/espi_realtek_rts5912.c b/drivers/espi/espi_realtek_rts5912.c
index 010f664d1ad..d35593f4747 100644
--- a/drivers/espi/espi_realtek_rts5912.c
+++ b/drivers/espi/espi_realtek_rts5912.c
@@ -41,6 +41,11 @@ struct espi_rts5912_config {
 	uint32_t emi0_clk_grp;
 	uint32_t emi0_clk_idx;
 #endif
+#ifdef CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION
+	volatile struct emi_reg *const emi1_reg;
+	uint32_t emi1_clk_grp;
+	uint32_t emi1_clk_idx;
+#endif
 #ifdef CONFIG_ESPI_PERIPHERAL_DEBUG_PORT_80
 	volatile struct port80_reg *const port80_reg;
 	uint32_t port80_clk_grp;
@@ -66,6 +71,26 @@ struct espi_rts5912_data {
 #endif
 };
 
+/*
+ * =========================================================================
+ * ESPI Peripheral Shared Memory Region
+ * =========================================================================
+ */
+
+#ifdef CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION
+#define ESPI_RTK_PERIPHERAL_ACPI_SHD_MEM_SIZE 256
+
+static uint8_t acpi_shd_mem_sram[ESPI_RTK_PERIPHERAL_ACPI_SHD_MEM_SIZE] __aligned(256);
+
+static void espi_setup_acpi_shm(const struct espi_rts5912_config *const espi_config)
+{
+	volatile struct emi_reg *const emi1_reg = espi_config->emi1_reg;
+
+	emi1_reg->SAR = (uint32_t)&acpi_shd_mem_sram[0];
+}
+
+#endif /* CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION */
+
 /*
  * =========================================================================
  * ESPI Peripheral Host IO (ACPI)
@@ -1858,6 +1883,10 @@ static int espi_rts5912_init(const struct device *dev)
 	/* Setup eSPI bus reset */
 	espi_bus_reset_setup(dev);
 
+#ifdef CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION
+	espi_setup_acpi_shm(espi_config);
+#endif
+
 #ifdef CONFIG_ESPI_PERIPHERAL_HOST_IO
 	/* Setup ACPI */
 	rc = espi_acpi_setup(dev);
@@ -1935,6 +1964,11 @@ static const struct espi_rts5912_config espi_rts5912_config = {
 	.emi0_clk_grp = DT_CLOCKS_CELL_BY_NAME(DT_DRV_INST(0), emi0, clk_grp),
 	.emi0_clk_idx = DT_CLOCKS_CELL_BY_NAME(DT_DRV_INST(0), emi0, clk_idx),
 #endif
+#ifdef CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION
+	.emi1_reg = (volatile struct emi_reg *const)DT_INST_REG_ADDR_BY_NAME(0, emi1),
+	.emi1_clk_grp = DT_CLOCKS_CELL_BY_NAME(DT_DRV_INST(0), emi1, clk_grp),
+	.emi1_clk_idx = DT_CLOCKS_CELL_BY_NAME(DT_DRV_INST(0), emi1, clk_idx),
+#endif
 #ifdef CONFIG_ESPI_PERIPHERAL_DEBUG_PORT_80
 	.port80_reg = (volatile struct port80_reg *const)DT_INST_REG_ADDR_BY_NAME(0, port80),
 	.port80_clk_grp = DT_CLOCKS_CELL_BY_NAME(DT_DRV_INST(0), port80, clk_grp),