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clk: new basic clk type for fractional divider

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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>
This commit is contained in:
Heikki Krogerus 2014-05-15 16:40:25 +03:00 • committed by Rafael J. Wysocki
parent d6d211db37
commit e2d0e90fae
3 changed files with 167 additions and 0 deletions
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31
include/linux/clk-provider.h
View file

@ -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
*