+/* Returns a pointer to the clock source register for a peripheral */
+u32 *get_periph_source_reg(enum periph_id periph_id);
+
+/**
+ * Given a peripheral ID and the required source clock, this returns which
+ * value should be programmed into the source mux for that peripheral.
+ *
+ * There is special code here to handle the one source type with 5 sources.
+ *
+ * @param periph_id peripheral to start
+ * @param source PLL id of required parent clock
+ * @param mux_bits Set to number of bits in mux register: 2 or 4
+ * @param divider_bits Set to number of divider bits (8 or 16)
+ * @return mux value (0-4, or -1 if not found)
+ */
+int get_periph_clock_source(enum periph_id periph_id,
+ enum clock_id parent, int *mux_bits, int *divider_bits);
+
+/*
+ * Convert a device tree clock ID to our peripheral ID. They are mostly
+ * the same but we are very cautious so we check that a valid clock ID is
+ * provided.
+ *
+ * @param clk_id Clock ID according to tegra30 device tree binding
+ * @return peripheral ID, or PERIPH_ID_NONE if the clock ID is invalid
+ */
+enum periph_id clk_id_to_periph_id(int clk_id);
+
+/**
+ * Set the output frequency you want for each PLL clock.
+ * PLL output frequencies are programmed by setting their N, M and P values.
+ * The governing equations are:
+ * VCO = (Fi / m) * n, Fo = VCO / (2^p)
+ * where Fo is the output frequency from the PLL.
+ * Example: Set the output frequency to 216Mhz(Fo) with 12Mhz OSC(Fi)
+ * 216Mhz = ((12Mhz / m) * n) / (2^p) so n=432,m=12,p=1
+ * Please see Tegra TRM section 5.3 to get the detail for PLL Programming
+ *
+ * @param n PLL feedback divider(DIVN)
+ * @param m PLL input divider(DIVN)
+ * @param p post divider(DIVP)
+ * @param cpcon base PLL charge pump(CPCON)
+ * @return 0 if ok, -1 on error (the requested PLL is incorrect and cannot
+ * be overriden), 1 if PLL is already correct
+ */
+int clock_set_rate(enum clock_id clkid, u32 n, u32 m, u32 p, u32 cpcon);
+
+/* return 1 if a peripheral ID is in range */
+#define clock_type_id_isvalid(id) ((id) >= 0 && \
+ (id) < CLOCK_TYPE_COUNT)
+
+/* return 1 if a periphc_internal_id is in range */
+#define periphc_internal_id_isvalid(id) ((id) >= 0 && \
+ (id) < PERIPHC_COUNT)
+
+/* SoC-specific TSC init */
+void arch_timer_init(void);
+
+#endif /* _TEGRA_CLOCK_H_ */