diff --git a/plat/mediatek/mt8186/drivers/spm/mt_spm.h b/plat/mediatek/mt8186/drivers/spm/mt_spm.h
new file mode 100644
index 0000000..0e21b5e
--- /dev/null
+++ b/plat/mediatek/mt8186/drivers/spm/mt_spm.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2022, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MT_SPM_H
+#define MT_SPM_H
+
+#include <lib/bakery_lock.h>
+#include <lib/spinlock.h>
+#include <plat_mtk_lpm.h>
+
+/*
+ * ARM v8.2, the cache will turn off automatically when cpu
+ * power down. Therefore, there is no doubt to use the spin_lock here.
+ */
+#if !HW_ASSISTED_COHERENCY
+#define MT_SPM_USING_BAKERY_LOCK
+#endif
+
+#ifdef MT_SPM_USING_BAKERY_LOCK
+DECLARE_BAKERY_LOCK(spm_lock);
+#define plat_spm_lock() bakery_lock_get(&spm_lock)
+#define plat_spm_unlock() bakery_lock_release(&spm_lock)
+#else
+extern spinlock_t spm_lock;
+#define plat_spm_lock() spin_lock(&spm_lock)
+#define plat_spm_unlock() spin_unlock(&spm_lock)
+#endif
+
+#define MT_SPM_USING_SRCLKEN_RC
+
+/* spm extern operand definition */
+#define MT_SPM_EX_OP_CLR_26M_RECORD		BIT(0)
+#define MT_SPM_EX_OP_SET_WDT			BIT(1)
+#define MT_SPM_EX_OP_NON_GENERIC_RESOURCE_REQ	BIT(2)
+#define MT_SPM_EX_OP_SET_SUSPEND_MODE		BIT(3)
+#define MT_SPM_EX_OP_SET_IS_ADSP		BIT(4)
+#define MT_SPM_EX_OP_SRCLKEN_RC_BBLPM		BIT(5)
+#define MT_SPM_EX_OP_HW_S1_DETECT		BIT(6)
+#define MT_SPM_EX_OP_TRACE_LP			BIT(7)
+#define MT_SPM_EX_OP_TRACE_SUSPEND		BIT(8)
+#define MT_SPM_EX_OP_TRACE_TIMESTAMP_EN		BIT(9)
+#define MT_SPM_EX_OP_TIME_CHECK			BIT(10)
+#define MT_SPM_EX_OP_TIME_OBS			BIT(11)
+
+typedef enum {
+	WR_NONE = 0,
+	WR_UART_BUSY = 1,
+	WR_ABORT = 2,
+	WR_PCM_TIMER = 3,
+	WR_WAKE_SRC = 4,
+	WR_DVFSRC = 5,
+	WR_TWAM = 6,
+	WR_PMSR = 7,
+	WR_SPM_ACK_CHK = 8,
+	WR_UNKNOWN = 9,
+} wake_reason_t;
+
+/* for suspend vol. bin settings */
+enum MT_PLAT_SUSPEND_VCORE {
+	SPM_SUSPEND_VCORE_5500 = 0,
+	SPM_SUSPEND_VCORE_5250 = 1,
+	SPM_SUSPEND_VCORE_5000 = 2,
+};
+
+extern void spm_boot_init(void);
+
+static inline void spm_lock_get(void)
+{
+	plat_spm_lock();
+}
+
+static inline void spm_lock_release(void)
+{
+	plat_spm_unlock();
+}
+
+unsigned int spm_get_suspend_vcore_voltage_idx(void);
+
+#endif /* MT_SPM_H */