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clk: add non CONFIG_HAVE_CLK routines

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Many drivers are shared between architectures that may or may not have
HAVE_CLK selected for them.  To remove compilation errors for them we
enclose clk_*() calls in these drivers within #ifdef CONFIG_HAVE_CLK,
#endif.

This patch removes the need of these CONFIG_HAVE_CLK statements, by
introducing dummy routines when HAVE_CLK is not selected by platforms.
So, definition of these routines will always be available.  These calls
will return error for platforms that don't select HAVE_CLK.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Cc: Wolfram Sang <w.sang@pengutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jeff Garzik <jgarzik@redhat.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Bhupesh Sharma <bhupesh.sharma@st.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: viresh kumar <viresh.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Viresh Kumar 2012-07-30 14:39:27 -07:00 committed by Linus Torvalds
parent bf7c27e988
commit 93abe8e4b1
1 changed files with 109 additions and 59 deletions
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168
include/linux/clk.h
View file

@ -84,6 +84,43 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
#endif
/**
* clk_prepare - prepare a clock source
* @clk: clock source
*
* This prepares the clock source for use.
*
* Must not be called from within atomic context.
*/
#ifdef CONFIG_HAVE_CLK_PREPARE
int clk_prepare(struct clk *clk);
#else
static inline int clk_prepare(struct clk *clk)
{
might_sleep();
return 0;
}
#endif
/**
* clk_unprepare - undo preparation of a clock source
* @clk: clock source
*
* This undoes a previously prepared clock. The caller must balance
* the number of prepare and unprepare calls.
*
* Must not be called from within atomic context.
*/
#ifdef CONFIG_HAVE_CLK_PREPARE
void clk_unprepare(struct clk *clk);
#else
static inline void clk_unprepare(struct clk *clk)
{
might_sleep();
}
#endif
#ifdef CONFIG_HAVE_CLK
/**
* clk_get - lookup and obtain a reference to a clock producer.
* @dev: device for clock "consumer"
@ -121,24 +158,6 @@ struct clk *clk_get(struct device *dev, const char *id);
*/
struct clk *devm_clk_get(struct device *dev, const char *id);
/**
* clk_prepare - prepare a clock source
* @clk: clock source
*
* This prepares the clock source for use.
*
* Must not be called from within atomic context.
*/
#ifdef CONFIG_HAVE_CLK_PREPARE
int clk_prepare(struct clk *clk);
#else
static inline int clk_prepare(struct clk *clk)
{
might_sleep();
return 0;
}
#endif
/**
* clk_enable - inform the system when the clock source should be running.
* @clk: clock source
@ -167,47 +186,6 @@ int clk_enable(struct clk *clk);
*/
void clk_disable(struct clk *clk);
/**
* clk_unprepare - undo preparation of a clock source
* @clk: clock source
*
* This undoes a previously prepared clock. The caller must balance
* the number of prepare and unprepare calls.
*
* Must not be called from within atomic context.
*/
#ifdef CONFIG_HAVE_CLK_PREPARE
void clk_unprepare(struct clk *clk);
#else
static inline void clk_unprepare(struct clk *clk)
{
might_sleep();
}
#endif
/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
static inline int clk_prepare_enable(struct clk *clk)
{
int ret;
ret = clk_prepare(clk);
if (ret)
return ret;
ret = clk_enable(clk);
if (ret)
clk_unprepare(clk);
return ret;
}
/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
static inline void clk_disable_unprepare(struct clk *clk)
{
clk_disable(clk);
clk_unprepare(clk);
}
/**
* clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
* This is only valid once the clock source has been enabled.
@ -298,6 +276,78 @@ struct clk *clk_get_parent(struct clk *clk);
*/
struct clk *clk_get_sys(const char *dev_id, const char *con_id);
#else /* !CONFIG_HAVE_CLK */
static inline struct clk *clk_get(struct device *dev, const char *id)
{
return NULL;
}
static inline struct clk *devm_clk_get(struct device *dev, const char *id)
{
return NULL;
}
static inline void clk_put(struct clk *clk) {}
static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
static inline int clk_enable(struct clk *clk)
{
return 0;
}
static inline void clk_disable(struct clk *clk) {}
static inline unsigned long clk_get_rate(struct clk *clk)
{
return 0;
}
static inline int clk_set_rate(struct clk *clk, unsigned long rate)
{
return 0;
}
static inline long clk_round_rate(struct clk *clk, unsigned long rate)
{
return 0;
}
static inline int clk_set_parent(struct clk *clk, struct clk *parent)
{
return 0;
}
static inline struct clk *clk_get_parent(struct clk *clk)
{
return NULL;
}
#endif
/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
static inline int clk_prepare_enable(struct clk *clk)
{
int ret;
ret = clk_prepare(clk);
if (ret)
return ret;
ret = clk_enable(clk);
if (ret)
clk_unprepare(clk);
return ret;
}
/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
static inline void clk_disable_unprepare(struct clk *clk)
{
clk_disable(clk);
clk_unprepare(clk);
}
/**
* clk_add_alias - add a new clock alias
* @alias: name for clock alias