diff --git a/plat/mediatek/mt8186/drivers/spm/mt_spm_idle.h b/plat/mediatek/mt8186/drivers/spm/mt_spm_idle.h
new file mode 100644
index 0000000..7196190
--- /dev/null
+++ b/plat/mediatek/mt8186/drivers/spm/mt_spm_idle.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MT_SPM_IDLE_H
+#define MT_SPM_IDLE_H
+
+typedef void (*spm_idle_conduct)(struct spm_lp_scen *spm_lp, unsigned int *resource_req);
+
+typedef int (*spm_idle_conduct_restore)(int state_id,
+					struct spm_lp_scen *spm_lp,
+					struct wake_status *status);
+
+int mt_spm_idle_generic_enter(int state_id, unsigned int ext_opand, spm_idle_conduct fn);
+
+void mt_spm_idle_generic_resume(int state_id, unsigned int ext_opand,
+				struct wake_status **status,
+				spm_idle_conduct_restore fn);
+
+void mt_spm_idle_generic_init(void);
+
+#endif /* MT_SPM_IDLE_H */