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clk: Add devm_of_clk_add_hw_provider()/del_provider() APIs 

Sometimes we only have one of_clk_del_provider() call in driver
error and remove paths, because we're missing a
devm_of_clk_add_hw_provider() API. Introduce the API so we can
convert drivers to use this and potentially reduce the amount of
code needed to remove providers in drivers.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Stephen Boyd 2017-09-01 16:16:40 -07:00
parent 2bd6bf03f4
commit aa795c41d9
3 changed files with 66 additions and 0 deletions
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1
Documentation/driver-model/devres.txt
View File

@ -237,6 +237,7 @@ CLOCK
devm_clk_get()
devm_clk_put()
devm_clk_hw_register()
devm_of_clk_add_hw_provider()
DMA
dmam_alloc_coherent()

52
drivers/clk/clk.c
View File

@ -3177,6 +3177,37 @@ int of_clk_add_hw_provider(struct device_node *np,
}
EXPORT_SYMBOL_GPL(of_clk_add_hw_provider);
static void devm_of_clk_release_provider(struct device *dev, void *res)
{
of_clk_del_provider(*(struct device_node **)res);
}
int devm_of_clk_add_hw_provider(struct device *dev,
struct clk_hw *(*get)(struct of_phandle_args *clkspec,
void *data),
void *data)
{
struct device_node **ptr, *np;
int ret;
ptr = devres_alloc(devm_of_clk_release_provider, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return -ENOMEM;
np = dev->of_node;
ret = of_clk_add_hw_provider(np, get, data);
if (!ret) {
*ptr = np;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return ret;
}
EXPORT_SYMBOL_GPL(devm_of_clk_add_hw_provider);
/**
* of_clk_del_provider() - Remove a previously registered clock provider
* @np: Device node pointer associated with clock provider
@ -3198,6 +3229,27 @@ void of_clk_del_provider(struct device_node *np)
}
EXPORT_SYMBOL_GPL(of_clk_del_provider);
static int devm_clk_provider_match(struct device *dev, void *res, void *data)
{
struct device_node **np = res;
if (WARN_ON(!np || !*np))
return 0;
return *np == data;
}
void devm_of_clk_del_provider(struct device *dev)
{
int ret;
ret = devres_release(dev, devm_of_clk_release_provider,
devm_clk_provider_match, dev->of_node);
WARN_ON(ret);
}
EXPORT_SYMBOL(devm_of_clk_del_provider);
static struct clk_hw *
__of_clk_get_hw_from_provider(struct of_clk_provider *provider,
struct of_phandle_args *clkspec)

13
include/linux/clk-provider.h
View File

@ -815,7 +815,12 @@ int of_clk_add_hw_provider(struct device_node *np,
struct clk_hw *(*get)(struct of_phandle_args *clkspec,
void *data),
void *data);
int devm_of_clk_add_hw_provider(struct device *dev,
struct clk_hw *(*get)(struct of_phandle_args *clkspec,
void *data),
void *data);
void of_clk_del_provider(struct device_node *np);
void devm_of_clk_del_provider(struct device *dev);
struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
void *data);
struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec,
@ -847,7 +852,15 @@ static inline int of_clk_add_hw_provider(struct device_node *np,
{
return 0;
}
static inline int devm_of_clk_add_hw_provider(struct device *dev,
struct clk_hw *(*get)(struct of_phandle_args *clkspec,
void *data),
void *data)
{
return 0;
}
static inline void of_clk_del_provider(struct device_node *np) {}
static inline void devm_of_clk_del_provider(struct device *dev) {}
static inline struct clk *of_clk_src_simple_get(
struct of_phandle_args *clkspec, void *data)
{