1. 根目录:
2. arch
3. arm
4. mach-pxa
5. clock.h

#include <linux/clkdev.h>
#include <linux/sysdev.h>

struct clkops {
	void			(*enable)(struct clk *);
	void			(*disable)(struct clk *);
	unsigned long		(*getrate)(struct clk *);
};

struct clk {
	const struct clkops	*ops;
	unsigned long		rate;
	unsigned int		cken;
	unsigned int		delay;
	unsigned int		enabled;
};

void clk_dummy_enable(struct clk *);
void clk_dummy_disable(struct clk *);

extern const struct clkops clk_dummy_ops;
extern struct clk clk_dummy;

#define INIT_CLKREG(_clk,_devname,_conname)		\
	{						\
		.clk		= _clk,			\
		.dev_id		= _devname,		\
		.con_id		= _conname,		\
	}

#define DEFINE_CK(_name, _cken, _ops)			\
struct clk clk_##_name = {				\
		.ops	= _ops,				\
		.cken	= CKEN_##_cken,			\
	}

#define DEFINE_CLK(_name, _ops, _rate, _delay)		\
struct clk clk_##_name = {				\
		.ops	= _ops, 			\
		.rate	= _rate,			\
		.delay	= _delay,			\
	}

#define DEFINE_PXA2_CKEN(_name, _cken, _rate, _delay)	\
struct clk clk_##_name = {				\
		.ops	= &clk_pxa2xx_cken_ops,		\
		.rate	= _rate,			\
		.cken	= CKEN_##_cken,			\
		.delay	= _delay,			\
	}

extern const struct clkops clk_pxa2xx_cken_ops;

void clk_pxa2xx_cken_enable(struct clk *clk);
void clk_pxa2xx_cken_disable(struct clk *clk);

extern struct sysdev_class pxa2xx_clock_sysclass;

#if defined(CONFIG_PXA3xx) || defined(CONFIG_PXA95x)
#define DEFINE_PXA3_CKEN(_name, _cken, _rate, _delay)	\
struct clk clk_##_name = {				\
		.ops	= &clk_pxa3xx_cken_ops,		\
		.rate	= _rate,			\
		.cken	= CKEN_##_cken,			\
		.delay	= _delay,			\
	}

extern const struct clkops clk_pxa3xx_cken_ops;
extern const struct clkops clk_pxa3xx_hsio_ops;
extern const struct clkops clk_pxa3xx_ac97_ops;
extern const struct clkops clk_pxa3xx_pout_ops;
extern const struct clkops clk_pxa3xx_smemc_ops;

extern void clk_pxa3xx_cken_enable(struct clk *);
extern void clk_pxa3xx_cken_disable(struct clk *);

extern struct sysdev_class pxa3xx_clock_sysclass;
#endif