ARM: AM33xx: Add support for Clock Synthesizer

The CDCE913 and CDCEL913 devices are modular PLL-based, low cost,
high performance , programmable clock synthesizers. They generate
upto 3 output clocks from a single input frequency. Each output can
be programmed for any clock-frequency.

Adding support for the same.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

arch/arm/include/asm/arch-am33xx/clk_synthesizer.h

@@ -0,0 +1,43 @@
+/*
+ * clk-synthesizer.h
+ *
+ * Clock synthesizer header
+ *
+ * Copyright (C) 2016, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __CLK_SYNTHESIZER_H
+#define __CLK_SYNTHESIZER_H
+
+#include <common.h>
+
+#define CLK_SYNTHESIZER_ID_REG		0x0
+#define CLK_SYNTHESIZER_XCSEL		0x05
+#define CLK_SYNTHESIZER_MUX_REG		0x14
+#define CLK_SYNTHESIZER_PDIV2_REG	0x16
+#define CLK_SYNTHESIZER_PDIV3_REG	0x17
+
+#define CLK_SYNTHESIZER_BYTE_MODE	0x80
+
+/**
+ * struct clk_synth: This structure holds data neeed for configuring
+ *		     for clock synthesizer.
+ * @id: The id of synthesizer
+ * @capacitor: value of the capacitor attached
+ * @mux: mux settings.
+ * @pdiv2: Div to be applied to second output
+ * @pdiv3: Div to be applied to third output
+ */
+struct clk_synth {
+	u32 id;
+	u32 capacitor;
+	u32 mux;
+	u32 pdiv2;
+	u32 pdiv3;
+};
+
+int setup_clock_synthesizer(struct clk_synth *data);
+
+#endif