clk: new basic clk type for fractional divider

Fractional divider clocks are fairly common. This adds basic
type for them.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 511917416fb0..fb4eca6907cd 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -413,6 +413,37 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
                 const char *parent_name, unsigned long flags,
                 unsigned int mult, unsigned int div);
 
+/**
+ * struct clk_fractional_divider - adjustable fractional divider clock
+ *
+ * @hw:         handle between common and hardware-specific interfaces
+ * @reg:        register containing the divider
+ * @mshift:     shift to the numerator bit field
+ * @mwidth:     width of the numerator bit field
+ * @nshift:     shift to the denominator bit field
+ * @nwidth:     width of the denominator bit field
+ * @lock:       register lock
+ *
+ * Clock with adjustable fractional divider affecting its output frequency.
+ */
+
+struct clk_fractional_divider {
+        struct clk_hw   hw;
+        void __iomem    *reg;
+        u8              mshift;
+        u32             mmask;
+        u8              nshift;
+        u32             nmask;
+        u8              flags;
+        spinlock_t      *lock;
+};
+
+extern const struct clk_ops clk_fractional_divider_ops;
+struct clk *clk_register_fractional_divider(struct device *dev,
+                const char *name, const char *parent_name, unsigned long flags,
+                void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth,
+                u8 clk_divider_flags, spinlock_t *lock);
+
 /***
  * struct clk_composite - aggregate clock of mux, divider and gate clocks
  *