ARM: tegra: add APIs the clock uclass driver will need

[karo-tx-uboot.git] / arch / arm / include / asm / arch-tegra / clock.h

diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h
index e0737f574addb3dd04f5cdaf0e8be1b415fa4641..388afcb72316d29a4c09e4f70a53b8c9bae45f69 100644 (file)
--- a/arch/arm/include/asm/arch-tegra/clock.h
+++ b/arch/arm/include/asm/arch-tegra/clock.h
@@ -186,6 +186,16 @@ int clock_ll_set_source_bits(enum periph_id periph_id, int mux_bits,
 void clock_ll_set_source_divisor(enum periph_id periph_id, unsigned source,
                unsigned divisor);
 
+/**
+ * Returns the current parent clock ID of a given peripheral. This can be
+ * useful in order to call clock_*_periph_*() from generic code that has no
+ * specific knowledge of system-level clock tree structure.
+ *
+ * @param periph_id    peripheral to query
+ * @return clock ID of the peripheral's current parent clock
+ */
+enum clock_id clock_get_periph_parent(enum periph_id periph_id);
+
 /**
  * Start a peripheral PLL clock at the given rate. This also resets the
  * peripheral.
@@ -284,6 +294,36 @@ u32 *get_periph_source_reg(enum periph_id periph_id);
 /* Returns a pointer to the given 'simple' PLL */
 struct clk_pll_simple *clock_get_simple_pll(enum clock_id clkid);
 
+/*
+ * Given a peripheral ID, determine where the mux bits are in the peripheral
+ * clock's register, the number of divider bits the clock has, and the SoC-
+ * specific clock type.
+ *
+ * This is an internal API between the core Tegra clock code and the SoC-
+ * specific clock code.
+ *
+ * @param periph_id     peripheral to query
+ * @param mux_bits      Set to number of bits in mux register
+ * @param divider_bits  Set to the relevant MASK_BITS_* value
+ * @param type          Set to the SoC-specific clock type
+ * @return 0 on success, -1 on error
+ */
+int get_periph_clock_info(enum periph_id periph_id, int *mux_bits,
+                         int *divider_bits, int *type);
+
+/*
+ * Given a peripheral ID and clock source mux value, determine the clock_id
+ * of that peripheral's parent.
+ *
+ * This is an internal API between the core Tegra clock code and the SoC-
+ * specific clock code.
+ *
+ * @param periph_id     peripheral to query
+ * @param source        raw clock source mux value
+ * @return the CLOCK_ID_* value @source represents
+ */
+enum clock_id get_periph_clock_id(enum periph_id periph_id, int source);
+
 /**
  * Given a peripheral ID and the required source clock, this returns which
  * value should be programmed into the source mux for that peripheral.