feat(mt8188): add DCM driver
DCM means dynamic clock management, and it can dynamically
slow down or gate clocks during CPU or bus idle.
1. Add MCUSYS related DCM drivers.
2. Enable MCUSYS related DCM by default.
Change-Id: I131354d72bbc190af504e9639bcc85a720e2bb17
diff --git a/plat/mediatek/drivers/dcm/mtk_dcm.h b/plat/mediatek/drivers/dcm/mtk_dcm.h
new file mode 100644
index 0000000..05f8d45
--- /dev/null
+++ b/plat/mediatek/drivers/dcm/mtk_dcm.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2022, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MTK_DCM_H
+#define MTK_DCM_H
+
+#include <stdbool.h>
+
+bool dcm_check_state(uintptr_t addr, unsigned int mask, unsigned int compare);
+int dcm_set_init(void);
+
+#endif /* #ifndef MTK_DCM_H */