clk: mediatek: Add fixed clocks support for Mediatek SoC.

This patch adds fixed clocks support by using CCF fixed-rate
clock implementation.

Signed-off-by: James Liao <jamesjj.liao@mediatek.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>

drivers/clk/mediatek/clk-mtk.h

@@ -26,6 +26,23 @@ struct clk;
 
 #define MHZ (1000 * 1000)
 
+struct mtk_fixed_clk {
+	int id;
+	const char *name;
+	const char *parent;
+	unsigned long rate;
+};
+
+#define FIXED_CLK(_id, _name, _parent, _rate) {		\
+		.id = _id,				\
+		.name = _name,				\
+		.parent = _parent,			\
+		.rate = _rate,				\
+	}
+
+void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks,
+		int num, struct clk_onecell_data *clk_data);
+
 struct mtk_fixed_factor {
 	int id;
 	const char *name;